Finding the Fourth Proportional to 257,724.45, 386,493.98 and 89,199

Step by Step Solution

1. Step 1: Write the proportion equation
   257,724.45 : 386,493.98 = 89,199 : x
2. Step 2: Convert to fraction form
   257,724.45/386,493.98 = 89,199/x
3. Step 3: Cross multiply
   257,724.45x = 386,493.98 × 89,199
4. Step 4: Simplify right side
   257,724.45x = 34,474,876,076.03
5. Step 5: Solve for x
   x = 34,474,876,076.03/257,724.45
6. Step 6: Final answer
   x = 133,766.42