Finding the Fourth Proportional to 89,852.10, 134,778.15 and 81,104.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89,852.10 : 134,778.15 = 81,104.10 : x
2. Step 2: Convert to fraction form
   89,852.10/134,778.15 = 81,104.10/x
3. Step 3: Cross multiply
   89,852.10x = 134,778.15 × 81,104.10
4. Step 4: Simplify right side
   89,852.10x = 10,931,060,555.42
5. Step 5: Solve for x
   x = 10,931,060,555.42/89,852.10
6. Step 6: Final answer
   x = 121,656.15