Finding the Fourth Proportional to 129,087.37, 178,141.28 and 72,498.75

Step by Step Solution

1. Step 1: Write the proportion equation
   129,087.37 : 178,141.28 = 72,498.75 : x
2. Step 2: Convert to fraction form
   129,087.37/178,141.28 = 72,498.75/x
3. Step 3: Cross multiply
   129,087.37x = 178,141.28 × 72,498.75
4. Step 4: Simplify right side
   129,087.37x = 12,915,019,092.88
5. Step 5: Solve for x
   x = 12,915,019,092.88/129,087.37
6. Step 6: Final answer
   x = 100,048.66