Finding the Fourth Proportional to 131,611.20, 197,287.20 and 65,061.60

Step by Step Solution

1. Step 1: Write the proportion equation
   131,611.20 : 197,287.20 = 65,061.60 : x
2. Step 2: Convert to fraction form
   131,611.20/197,287.20 = 65,061.60/x
3. Step 3: Cross multiply
   131,611.20x = 197,287.20 × 65,061.60
4. Step 4: Simplify right side
   131,611.20x = 12,835,820,891.52
5. Step 5: Solve for x
   x = 12,835,820,891.52/131,611.20
6. Step 6: Final answer
   x = 97,528.33