Finding the Fourth Proportional to 129,510.77, 178,722.15 and 72,150.02

Step by Step Solution

1. Step 1: Write the proportion equation
   129,510.77 : 178,722.15 = 72,150.02 : x
2. Step 2: Convert to fraction form
   129,510.77/178,722.15 = 72,150.02/x
3. Step 3: Cross multiply
   129,510.77x = 178,722.15 × 72,150.02
4. Step 4: Simplify right side
   129,510.77x = 12,894,806,696.94
5. Step 5: Solve for x
   x = 12,894,806,696.94/129,510.77
6. Step 6: Final answer
   x = 99,565.52