Finding the Fourth Proportional to 72,499.80, 108,603.90 and 48,880.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,499.80 : 108,603.90 = 48,880.20 : x
2. Step 2: Convert to fraction form
   72,499.80/108,603.90 = 48,880.20/x
3. Step 3: Cross multiply
   72,499.80x = 108,603.90 × 48,880.20
4. Step 4: Simplify right side
   72,499.80x = 5,308,580,352.78
5. Step 5: Solve for x
   x = 5,308,580,352.78/72,499.80
6. Step 6: Final answer
   x = 73,222.00