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Finding the Fourth Proportional to 278,859.70, 418,617.60 and 276,891.40

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Solution

The fourth proportional to 278,859.70, 418,617.60 and 276,891.40 is: 415,662.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,859.70 : 418,617.60 = 276,891.40 : x
  2. Step 2: Convert to fraction form
    278,859.70/418,617.60 = 276,891.40/x
  3. Step 3: Cross multiply
    278,859.70x = 418,617.60 × 276,891.40
  4. Step 4: Simplify right side
    278,859.70x = 115,911,613,328.64
  5. Step 5: Solve for x
    x = 115,911,613,328.64/278,859.70
  6. Step 6: Final answer
    x = 415,662.83

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