Finding the Fourth Proportional to 81,880.92, 122,887.58 and 42,449.31

Step by Step Solution

1. Step 1: Write the proportion equation
   81,880.92 : 122,887.58 = 42,449.31 : x
2. Step 2: Convert to fraction form
   81,880.92/122,887.58 = 42,449.31/x
3. Step 3: Cross multiply
   81,880.92x = 122,887.58 × 42,449.31
4. Step 4: Simplify right side
   81,880.92x = 5,216,492,766.32
5. Step 5: Solve for x
   x = 5,216,492,766.32/81,880.92
6. Step 6: Final answer
   x = 63,708.28