Finding the Fourth Proportional to 99,406.80, 137,173.32 and 56,969.04

Step by Step Solution

1. Step 1: Write the proportion equation
   99,406.80 : 137,173.32 = 56,969.04 : x
2. Step 2: Convert to fraction form
   99,406.80/137,173.32 = 56,969.04/x
3. Step 3: Cross multiply
   99,406.80x = 137,173.32 × 56,969.04
4. Step 4: Simplify right side
   99,406.80x = 7,814,632,354.01
5. Step 5: Solve for x
   x = 7,814,632,354.01/99,406.80
6. Step 6: Final answer
   x = 78,612.65