Finding the Fourth Proportional to 80,820.90, 111,502.17 and 48,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   80,820.90 : 111,502.17 = 48,978.18 : x
2. Step 2: Convert to fraction form
   80,820.90/111,502.17 = 48,978.18/x
3. Step 3: Cross multiply
   80,820.90x = 111,502.17 × 48,978.18
4. Step 4: Simplify right side
   80,820.90x = 5,461,173,352.65
5. Step 5: Solve for x
   x = 5,461,173,352.65/80,820.90
6. Step 6: Final answer
   x = 67,571.30