Finding the Fourth Proportional to 257,672.18, 386,504.43 and 89,315.06

Step by Step Solution

1. Step 1: Write the proportion equation
   257,672.18 : 386,504.43 = 89,315.06 : x
2. Step 2: Convert to fraction form
   257,672.18/386,504.43 = 89,315.06/x
3. Step 3: Cross multiply
   257,672.18x = 386,504.43 × 89,315.06
4. Step 4: Simplify right side
   257,672.18x = 34,520,666,355.72
5. Step 5: Solve for x
   x = 34,520,666,355.72/257,672.18
6. Step 6: Final answer
   x = 133,971.26