Finding the Fourth Proportional to 80,686.38, 121,045.98 and 28,099.98

Step by Step Solution

1. Step 1: Write the proportion equation
   80,686.38 : 121,045.98 = 28,099.98 : x
2. Step 2: Convert to fraction form
   80,686.38/121,045.98 = 28,099.98/x
3. Step 3: Cross multiply
   80,686.38x = 121,045.98 × 28,099.98
4. Step 4: Simplify right side
   80,686.38x = 3,401,389,617.08
5. Step 5: Solve for x
   x = 3,401,389,617.08/80,686.38
6. Step 6: Final answer
   x = 42,155.68