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Finding the Fourth Proportional to 661,085.74, 912,487.48 and 389,311.28

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Solution

The fourth proportional to 661,085.74, 912,487.48 and 389,311.28 is: 537,360.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,085.74 : 912,487.48 = 389,311.28 : x
  2. Step 2: Convert to fraction form
    661,085.74/912,487.48 = 389,311.28/x
  3. Step 3: Cross multiply
    661,085.74x = 912,487.48 × 389,311.28
  4. Step 4: Simplify right side
    661,085.74x = 355,241,668,822.77
  5. Step 5: Solve for x
    x = 355,241,668,822.77/661,085.74
  6. Step 6: Final answer
    x = 537,360.96

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