Finding the Fourth Proportional to 81,772.72, 112,527.50 and 72,363.76

Step by Step Solution

1. Step 1: Write the proportion equation
   81,772.72 : 112,527.50 = 72,363.76 : x
2. Step 2: Convert to fraction form
   81,772.72/112,527.50 = 72,363.76/x
3. Step 3: Cross multiply
   81,772.72x = 112,527.50 × 72,363.76
4. Step 4: Simplify right side
   81,772.72x = 8,142,913,003.40
5. Step 5: Solve for x
   x = 8,142,913,003.40/81,772.72
6. Step 6: Final answer
   x = 99,579.82