Finding the Fourth Proportional to 156,689.77, 216,245.27 and 88,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   156,689.77 : 216,245.27 = 88,718.72 : x
2. Step 2: Convert to fraction form
   156,689.77/216,245.27 = 88,718.72/x
3. Step 3: Cross multiply
   156,689.77x = 216,245.27 × 88,718.72
4. Step 4: Simplify right side
   156,689.77x = 19,185,003,560.45
5. Step 5: Solve for x
   x = 19,185,003,560.45/156,689.77
6. Step 6: Final answer
   x = 122,439.41