Finding the Fourth Proportional to 80,856.72, 121,340.61 and 28,266.30

Step by Step Solution

1. Step 1: Write the proportion equation
   80,856.72 : 121,340.61 = 28,266.30 : x
2. Step 2: Convert to fraction form
   80,856.72/121,340.61 = 28,266.30/x
3. Step 3: Cross multiply
   80,856.72x = 121,340.61 × 28,266.30
4. Step 4: Simplify right side
   80,856.72x = 3,429,850,084.44
5. Step 5: Solve for x
   x = 3,429,850,084.44/80,856.72
6. Step 6: Final answer
   x = 42,418.86