Finding the Fourth Proportional to 99,009.28, 136,635.52 and 56,574.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,009.28 : 136,635.52 = 56,574.72 : x
2. Step 2: Convert to fraction form
   99,009.28/136,635.52 = 56,574.72/x
3. Step 3: Cross multiply
   99,009.28x = 136,635.52 × 56,574.72
4. Step 4: Simplify right side
   99,009.28x = 7,730,116,286.05
5. Step 5: Solve for x
   x = 7,730,116,286.05/99,009.28
6. Step 6: Final answer
   x = 78,074.66