Finding the Fourth Proportional to 89,231.10, 133,583.69 and 78,159.42

Step by Step Solution

1. Step 1: Write the proportion equation
   89,231.10 : 133,583.69 = 78,159.42 : x
2. Step 2: Convert to fraction form
   89,231.10/133,583.69 = 78,159.42/x
3. Step 3: Cross multiply
   89,231.10x = 133,583.69 × 78,159.42
4. Step 4: Simplify right side
   89,231.10x = 10,440,823,341.06
5. Step 5: Solve for x
   x = 10,440,823,341.06/89,231.10
6. Step 6: Final answer
   x = 117,008.79