Finding the Fourth Proportional to 89,141.31, 133,410.57 and 86,742.46

Step by Step Solution

1. Step 1: Write the proportion equation
   89,141.31 : 133,410.57 = 86,742.46 : x
2. Step 2: Convert to fraction form
   89,141.31/133,410.57 = 86,742.46/x
3. Step 3: Cross multiply
   89,141.31x = 133,410.57 × 86,742.46
4. Step 4: Simplify right side
   89,141.31x = 11,572,361,031.80
5. Step 5: Solve for x
   x = 11,572,361,031.80/89,141.31
6. Step 6: Final answer
   x = 129,820.41