Finding the Fourth Proportional to 113,731.12, 157,013.12 and 78,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113,731.12 : 157,013.12 = 78,868.72 : x
2. Step 2: Convert to fraction form
   113,731.12/157,013.12 = 78,868.72/x
3. Step 3: Cross multiply
   113,731.12x = 157,013.12 × 78,868.72
4. Step 4: Simplify right side
   113,731.12x = 12,383,423,797.61
5. Step 5: Solve for x
   x = 12,383,423,797.61/113,731.12
6. Step 6: Final answer
   x = 108,883.34