Finding the Fourth Proportional to 72,451.24, 99,987.54 and 40,622.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,451.24 : 99,987.54 = 40,622.20 : x
2. Step 2: Convert to fraction form
   72,451.24/99,987.54 = 40,622.20/x
3. Step 3: Cross multiply
   72,451.24x = 99,987.54 × 40,622.20
4. Step 4: Simplify right side
   72,451.24x = 4,061,713,847.39
5. Step 5: Solve for x
   x = 4,061,713,847.39/72,451.24
6. Step 6: Final answer
   x = 56,061.34