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Finding the Fourth Proportional to 1,787.27, 2,679.89 and 812.43

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Solution

The fourth proportional to 1,787.27, 2,679.89 and 812.43 is: 1,218.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.27 : 2,679.89 = 812.43 : x
  2. Step 2: Convert to fraction form
    1,787.27/2,679.89 = 812.43/x
  3. Step 3: Cross multiply
    1,787.27x = 2,679.89 × 812.43
  4. Step 4: Simplify right side
    1,787.27x = 2,177,218.97
  5. Step 5: Solve for x
    x = 2,177,218.97/1,787.27
  6. Step 6: Final answer
    x = 1,218.18

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