Finding the Fourth Proportional to 72,399.78, 99,914.40 and 40,567.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,399.78 : 99,914.40 = 40,567.50 : x
2. Step 2: Convert to fraction form
   72,399.78/99,914.40 = 40,567.50/x
3. Step 3: Cross multiply
   72,399.78x = 99,914.40 × 40,567.50
4. Step 4: Simplify right side
   72,399.78x = 4,053,277,422
5. Step 5: Solve for x
   x = 4,053,277,422/72,399.78
6. Step 6: Final answer
   x = 55,984.66