Finding the Fourth Proportional to 72,018.48, 99,385.28 and 40,187.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,018.48 : 99,385.28 = 40,187.04 : x
2. Step 2: Convert to fraction form
   72,018.48/99,385.28 = 40,187.04/x
3. Step 3: Cross multiply
   72,018.48x = 99,385.28 × 40,187.04
4. Step 4: Simplify right side
   72,018.48x = 3,994,000,222.77
5. Step 5: Solve for x
   x = 3,994,000,222.77/72,018.48
6. Step 6: Final answer
   x = 55,457.99