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Finding the Fourth Proportional to 85,698.72, 128,528.64 and 30,294.72

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Solution

The fourth proportional to 85,698.72, 128,528.64 and 30,294.72 is: 45,435.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,698.72 : 128,528.64 = 30,294.72 : x
  2. Step 2: Convert to fraction form
    85,698.72/128,528.64 = 30,294.72/x
  3. Step 3: Cross multiply
    85,698.72x = 128,528.64 × 30,294.72
  4. Step 4: Simplify right side
    85,698.72x = 3,893,739,160.78
  5. Step 5: Solve for x
    x = 3,893,739,160.78/85,698.72
  6. Step 6: Final answer
    x = 45,435.21

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