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Finding the Fourth Proportional to 720.28, 994.04 and 405.56

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Solution

The fourth proportional to 720.28, 994.04 and 405.56 is: 559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.28 : 994.04 = 405.56 : x
  2. Step 2: Convert to fraction form
    720.28/994.04 = 405.56/x
  3. Step 3: Cross multiply
    720.28x = 994.04 × 405.56
  4. Step 4: Simplify right side
    720.28x = 403,142.86
  5. Step 5: Solve for x
    x = 403,142.86/720.28
  6. Step 6: Final answer
    x = 559.70

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