Finding the Fourth Proportional to 80,707.88, 121,061.42 and 20,736.30

Step by Step Solution

1. Step 1: Write the proportion equation
   80,707.88 : 121,061.42 = 20,736.30 : x
2. Step 2: Convert to fraction form
   80,707.88/121,061.42 = 20,736.30/x
3. Step 3: Cross multiply
   80,707.88x = 121,061.42 × 20,736.30
4. Step 4: Simplify right side
   80,707.88x = 2,510,365,923.55
5. Step 5: Solve for x
   x = 2,510,365,923.55/80,707.88
6. Step 6: Final answer
   x = 31,104.35