Finding the Fourth Proportional to 87,399, 120,610.62 and 49,680.54

Step by Step Solution

1. Step 1: Write the proportion equation
   87,399 : 120,610.62 = 49,680.54 : x
2. Step 2: Convert to fraction form
   87,399/120,610.62 = 49,680.54/x
3. Step 3: Cross multiply
   87,399x = 120,610.62 × 49,680.54
4. Step 4: Simplify right side
   87,399x = 5,992,000,731.33
5. Step 5: Solve for x
   x = 5,992,000,731.33/87,399
6. Step 6: Final answer
   x = 68,559.15