Finding the Fourth Proportional to 99,933.32, 137,909.78 and 54,613.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,933.32 : 137,909.78 = 54,613.20 : x
2. Step 2: Convert to fraction form
   99,933.32/137,909.78 = 54,613.20/x
3. Step 3: Cross multiply
   99,933.32x = 137,909.78 × 54,613.20
4. Step 4: Simplify right side
   99,933.32x = 7,531,694,397.10
5. Step 5: Solve for x
   x = 7,531,694,397.10/99,933.32
6. Step 6: Final answer
   x = 75,367.20