Finding the Fourth Proportional to 87,280.78, 120,447.56 and 49,555.03

Step by Step Solution

1. Step 1: Write the proportion equation
   87,280.78 : 120,447.56 = 49,555.03 : x
2. Step 2: Convert to fraction form
   87,280.78/120,447.56 = 49,555.03/x
3. Step 3: Cross multiply
   87,280.78x = 120,447.56 × 49,555.03
4. Step 4: Simplify right side
   87,280.78x = 5,968,782,856.60
5. Step 5: Solve for x
   x = 5,968,782,856.60/87,280.78
6. Step 6: Final answer
   x = 68,385.99