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Finding the Fourth Proportional to 1,387.06, 2,080.90 and 521.38

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Solution

The fourth proportional to 1,387.06, 2,080.90 and 521.38 is: 782.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.06 : 2,080.90 = 521.38 : x
  2. Step 2: Convert to fraction form
    1,387.06/2,080.90 = 521.38/x
  3. Step 3: Cross multiply
    1,387.06x = 2,080.90 × 521.38
  4. Step 4: Simplify right side
    1,387.06x = 1,084,939.64
  5. Step 5: Solve for x
    x = 1,084,939.64/1,387.06
  6. Step 6: Final answer
    x = 782.19

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