Finding the Fourth Proportional to 81,098.61, 121,484.79 and 40,449.57

Step by Step Solution

1. Step 1: Write the proportion equation
   81,098.61 : 121,484.79 = 40,449.57 : x
2. Step 2: Convert to fraction form
   81,098.61/121,484.79 = 40,449.57/x
3. Step 3: Cross multiply
   81,098.61x = 121,484.79 × 40,449.57
4. Step 4: Simplify right side
   81,098.61x = 4,914,007,517.04
5. Step 5: Solve for x
   x = 4,914,007,517.04/81,098.61
6. Step 6: Final answer
   x = 60,592.99