Finding the Fourth Proportional to 72,448.24, 99,983.40 and 40,619.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,448.24 : 99,983.40 = 40,619.20 : x
2. Step 2: Convert to fraction form
   72,448.24/99,983.40 = 40,619.20/x
3. Step 3: Cross multiply
   72,448.24x = 99,983.40 × 40,619.20
4. Step 4: Simplify right side
   72,448.24x = 4,061,245,721.28
5. Step 5: Solve for x
   x = 4,061,245,721.28/72,448.24
6. Step 6: Final answer
   x = 56,057.20