Finding the Fourth Proportional to 72,054.72, 99,435.60 and 40,223.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,054.72 : 99,435.60 = 40,223.60 : x
2. Step 2: Convert to fraction form
   72,054.72/99,435.60 = 40,223.60/x
3. Step 3: Cross multiply
   72,054.72x = 99,435.60 × 40,223.60
4. Step 4: Simplify right side
   72,054.72x = 3,999,657,800.16
5. Step 5: Solve for x
   x = 3,999,657,800.16/72,054.72
6. Step 6: Final answer
   x = 55,508.62