Finding the Fourth Proportional to 80,675.96, 121,033.56 and 28,085.72

Step by Step Solution

1. Step 1: Write the proportion equation
   80,675.96 : 121,033.56 = 28,085.72 : x
2. Step 2: Convert to fraction form
   80,675.96/121,033.56 = 28,085.72/x
3. Step 3: Cross multiply
   80,675.96x = 121,033.56 × 28,085.72
4. Step 4: Simplify right side
   80,675.96x = 3,399,314,676.76
5. Step 5: Solve for x
   x = 3,399,314,676.76/80,675.96
6. Step 6: Final answer
   x = 42,135.41