Finding the Fourth Proportional to 115,047.68, 172,539.86 and 72,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,047.68 : 172,539.86 = 72,864.50 : x
2. Step 2: Convert to fraction form
   115,047.68/172,539.86 = 72,864.50/x
3. Step 3: Cross multiply
   115,047.68x = 172,539.86 × 72,864.50
4. Step 4: Simplify right side
   115,047.68x = 12,572,029,401.95
5. Step 5: Solve for x
   x = 12,572,029,401.95/115,047.68
6. Step 6: Final answer
   x = 109,276.69