Finding the Fourth Proportional to 72,022.91, 99,391.47 and 40,189.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,022.91 : 99,391.47 = 40,189.91 : x
2. Step 2: Convert to fraction form
   72,022.91/99,391.47 = 40,189.91/x
3. Step 3: Cross multiply
   72,022.91x = 99,391.47 × 40,189.91
4. Step 4: Simplify right side
   72,022.91x = 3,994,534,234.07
5. Step 5: Solve for x
   x = 3,994,534,234.07/72,022.91
6. Step 6: Final answer
   x = 55,461.99