Finding the Fourth Proportional to 99,061.92, 136,705.86 and 56,621.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,061.92 : 136,705.86 = 56,621.88 : x
2. Step 2: Convert to fraction form
   99,061.92/136,705.86 = 56,621.88/x
3. Step 3: Cross multiply
   99,061.92x = 136,705.86 × 56,621.88
4. Step 4: Simplify right side
   99,061.92x = 7,740,542,800.22
5. Step 5: Solve for x
   x = 7,740,542,800.22/99,061.92
6. Step 6: Final answer
   x = 78,138.43