Finding the Fourth Proportional to 80,919.12, 121,300.26 and 30,960.72

Step by Step Solution

1. Step 1: Write the proportion equation
   80,919.12 : 121,300.26 = 30,960.72 : x
2. Step 2: Convert to fraction form
   80,919.12/121,300.26 = 30,960.72/x
3. Step 3: Cross multiply
   80,919.12x = 121,300.26 × 30,960.72
4. Step 4: Simplify right side
   80,919.12x = 3,755,543,385.79
5. Step 5: Solve for x
   x = 3,755,543,385.79/80,919.12
6. Step 6: Final answer
   x = 46,411.08