Finding the Fourth Proportional to 72,153.48, 99,572.17 and 40,322.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,153.48 : 99,572.17 = 40,322.91 : x
2. Step 2: Convert to fraction form
   72,153.48/99,572.17 = 40,322.91/x
3. Step 3: Cross multiply
   72,153.48x = 99,572.17 × 40,322.91
4. Step 4: Simplify right side
   72,153.48x = 4,015,039,649.41
5. Step 5: Solve for x
   x = 4,015,039,649.41/72,153.48
6. Step 6: Final answer
   x = 55,645.82