Finding the Fourth Proportional to 131,817.20, 181,907.69 and 71,387.88

Step by Step Solution

1. Step 1: Write the proportion equation
   131,817.20 : 181,907.69 = 71,387.88 : x
2. Step 2: Convert to fraction form
   131,817.20/181,907.69 = 71,387.88/x
3. Step 3: Cross multiply
   131,817.20x = 181,907.69 × 71,387.88
4. Step 4: Simplify right side
   131,817.20x = 12,986,003,987.86
5. Step 5: Solve for x
   x = 12,986,003,987.86/131,817.20
6. Step 6: Final answer
   x = 98,515.25