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Finding the Fourth Proportional to 387,428.64, 534,665.28 and 217,659.36

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Solution

The fourth proportional to 387,428.64, 534,665.28 and 217,659.36 is: 300,377.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,428.64 : 534,665.28 = 217,659.36 : x
  2. Step 2: Convert to fraction form
    387,428.64/534,665.28 = 217,659.36/x
  3. Step 3: Cross multiply
    387,428.64x = 534,665.28 × 217,659.36
  4. Step 4: Simplify right side
    387,428.64x = 116,374,902,659.02
  5. Step 5: Solve for x
    x = 116,374,902,659.02/387,428.64
  6. Step 6: Final answer
    x = 300,377.65

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