Finding the Fourth Proportional to 72,144.36, 99,561.42 and 40,314.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,144.36 : 99,561.42 = 40,314.60 : x
2. Step 2: Convert to fraction form
   72,144.36/99,561.42 = 40,314.60/x
3. Step 3: Cross multiply
   72,144.36x = 99,561.42 × 40,314.60
4. Step 4: Simplify right side
   72,144.36x = 4,013,778,822.73
5. Step 5: Solve for x
   x = 4,013,778,822.73/72,144.36
6. Step 6: Final answer
   x = 55,635.38