Finding the Fourth Proportional to 131,236.10, 181,105.76 and 71,620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   131,236.10 : 181,105.76 = 71,620.10 : x
2. Step 2: Convert to fraction form
   131,236.10/181,105.76 = 71,620.10/x
3. Step 3: Cross multiply
   131,236.10x = 181,105.76 × 71,620.10
4. Step 4: Simplify right side
   131,236.10x = 12,970,812,641.78
5. Step 5: Solve for x
   x = 12,970,812,641.78/131,236.10
6. Step 6: Final answer
   x = 98,835.71