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Finding the Fourth Proportional to 20,994.47, 28,974.42 and 15,680.06

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Solution

The fourth proportional to 20,994.47, 28,974.42 and 15,680.06 is: 21,640.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.47 : 28,974.42 = 15,680.06 : x
  2. Step 2: Convert to fraction form
    20,994.47/28,974.42 = 15,680.06/x
  3. Step 3: Cross multiply
    20,994.47x = 28,974.42 × 15,680.06
  4. Step 4: Simplify right side
    20,994.47x = 454,320,644.07
  5. Step 5: Solve for x
    x = 454,320,644.07/20,994.47
  6. Step 6: Final answer
    x = 21,640.01

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