Finding the Fourth Proportional to 80,790.73, 121,171.50 and 28,215.25

Step by Step Solution

1. Step 1: Write the proportion equation
   80,790.73 : 121,171.50 = 28,215.25 : x
2. Step 2: Convert to fraction form
   80,790.73/121,171.50 = 28,215.25/x
3. Step 3: Cross multiply
   80,790.73x = 121,171.50 × 28,215.25
4. Step 4: Simplify right side
   80,790.73x = 3,418,883,862.45
5. Step 5: Solve for x
   x = 3,418,883,862.45/80,790.73
6. Step 6: Final answer
   x = 42,317.78