Finding the Fourth Proportional to 83,978.24, 115,884.96 and 49,989.20

Step by Step Solution

1. Step 1: Write the proportion equation
   83,978.24 : 115,884.96 = 49,989.20 : x
2. Step 2: Convert to fraction form
   83,978.24/115,884.96 = 49,989.20/x
3. Step 3: Cross multiply
   83,978.24x = 115,884.96 × 49,989.20
4. Step 4: Simplify right side
   83,978.24x = 5,792,996,442.43
5. Step 5: Solve for x
   x = 5,792,996,442.43/83,978.24
6. Step 6: Final answer
   x = 68,982.11