Finding the Fourth Proportional to 72,118.68, 99,521.83 and 39,411.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,118.68 : 99,521.83 = 39,411.80 : x
2. Step 2: Convert to fraction form
   72,118.68/99,521.83 = 39,411.80/x
3. Step 3: Cross multiply
   72,118.68x = 99,521.83 × 39,411.80
4. Step 4: Simplify right side
   72,118.68x = 3,922,334,459.59
5. Step 5: Solve for x
   x = 3,922,334,459.59/72,118.68
6. Step 6: Final answer
   x = 54,387.22