Finding the Fourth Proportional to 129,114.30, 178,155.27 and 72,528.06

Step by Step Solution

1. Step 1: Write the proportion equation
   129,114.30 : 178,155.27 = 72,528.06 : x
2. Step 2: Convert to fraction form
   129,114.30/178,155.27 = 72,528.06/x
3. Step 3: Cross multiply
   129,114.30x = 178,155.27 × 72,528.06
4. Step 4: Simplify right side
   129,114.30x = 12,921,256,111.88
5. Step 5: Solve for x
   x = 12,921,256,111.88/129,114.30
6. Step 6: Final answer
   x = 100,076.10