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Finding the Fourth Proportional to 431,630.80, 647,446.20 and 403,982.80

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Solution

The fourth proportional to 431,630.80, 647,446.20 and 403,982.80 is: 605,974.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,630.80 : 647,446.20 = 403,982.80 : x
  2. Step 2: Convert to fraction form
    431,630.80/647,446.20 = 403,982.80/x
  3. Step 3: Cross multiply
    431,630.80x = 647,446.20 × 403,982.80
  4. Step 4: Simplify right side
    431,630.80x = 261,557,128,725.36
  5. Step 5: Solve for x
    x = 261,557,128,725.36/431,630.80
  6. Step 6: Final answer
    x = 605,974.20

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