Finding the Fourth Proportional to 72,307.24, 99,788.42 and 40,478.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,307.24 : 99,788.42 = 40,478.12 : x
2. Step 2: Convert to fraction form
   72,307.24/99,788.42 = 40,478.12/x
3. Step 3: Cross multiply
   72,307.24x = 99,788.42 × 40,478.12
4. Step 4: Simplify right side
   72,307.24x = 4,039,247,639.37
5. Step 5: Solve for x
   x = 4,039,247,639.37/72,307.24
6. Step 6: Final answer
   x = 55,862.28