Finding the Fourth Proportional to 156,708.72, 216,258.03 and 89,640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   156,708.72 : 216,258.03 = 89,640.72 : x
2. Step 2: Convert to fraction form
   156,708.72/216,258.03 = 89,640.72/x
3. Step 3: Cross multiply
   156,708.72x = 216,258.03 × 89,640.72
4. Step 4: Simplify right side
   156,708.72x = 19,385,525,739.08
5. Step 5: Solve for x
   x = 19,385,525,739.08/156,708.72
6. Step 6: Final answer
   x = 123,704.19