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Finding the Fourth Proportional to 636.78, 955.86 and 439.14

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Solution

The fourth proportional to 636.78, 955.86 and 439.14 is: 659.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.78 : 955.86 = 439.14 : x
  2. Step 2: Convert to fraction form
    636.78/955.86 = 439.14/x
  3. Step 3: Cross multiply
    636.78x = 955.86 × 439.14
  4. Step 4: Simplify right side
    636.78x = 419,756.36
  5. Step 5: Solve for x
    x = 419,756.36/636.78
  6. Step 6: Final answer
    x = 659.19

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