Finding the Fourth Proportional to 156,146.40, 234,375.12 and 86,058.72

Step by Step Solution

1. Step 1: Write the proportion equation
   156,146.40 : 234,375.12 = 86,058.72 : x
2. Step 2: Convert to fraction form
   156,146.40/234,375.12 = 86,058.72/x
3. Step 3: Cross multiply
   156,146.40x = 234,375.12 × 86,058.72
4. Step 4: Simplify right side
   156,146.40x = 20,170,022,827.05
5. Step 5: Solve for x
   x = 20,170,022,827.05/156,146.40
6. Step 6: Final answer
   x = 129,173.79