Finding the Fourth Proportional to 99,929.01, 137,909.89 and 56,910.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,929.01 : 137,909.89 = 56,910.32 : x
2. Step 2: Convert to fraction form
   99,929.01/137,909.89 = 56,910.32/x
3. Step 3: Cross multiply
   99,929.01x = 137,909.89 × 56,910.32
4. Step 4: Simplify right side
   99,929.01x = 7,848,495,697.43
5. Step 5: Solve for x
   x = 7,848,495,697.43/99,929.01
6. Step 6: Final answer
   x = 78,540.72