Finding the Fourth Proportional to 80,705.52, 121,074.12 and 28,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   80,705.52 : 121,074.12 = 28,116.72 : x
2. Step 2: Convert to fraction form
   80,705.52/121,074.12 = 28,116.72/x
3. Step 3: Cross multiply
   80,705.52x = 121,074.12 × 28,116.72
4. Step 4: Simplify right side
   80,705.52x = 3,404,207,131.29
5. Step 5: Solve for x
   x = 3,404,207,131.29/80,705.52
6. Step 6: Final answer
   x = 42,180.60