Finding the Fourth Proportional to 89,881.10, 134,854.05 and 86,641.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89,881.10 : 134,854.05 = 86,641.10 : x
2. Step 2: Convert to fraction form
   89,881.10/134,854.05 = 86,641.10/x
3. Step 3: Cross multiply
   89,881.10x = 134,854.05 × 86,641.10
4. Step 4: Simplify right side
   89,881.10x = 11,683,903,231.46
5. Step 5: Solve for x
   x = 11,683,903,231.46/89,881.10
6. Step 6: Final answer
   x = 129,992.88