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Finding the Fourth Proportional to 399,085.30, 598,919.55 and 280,987.30

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Solution

The fourth proportional to 399,085.30, 598,919.55 and 280,987.30 is: 421,686.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,085.30 : 598,919.55 = 280,987.30 : x
  2. Step 2: Convert to fraction form
    399,085.30/598,919.55 = 280,987.30/x
  3. Step 3: Cross multiply
    399,085.30x = 598,919.55 × 280,987.30
  4. Step 4: Simplify right side
    399,085.30x = 168,288,787,271.72
  5. Step 5: Solve for x
    x = 168,288,787,271.72/399,085.30
  6. Step 6: Final answer
    x = 421,686.26

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