Finding the Fourth Proportional to 12,321.60, 16,986.24 and 7,602.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,321.60 : 16,986.24 = 7,602.72 : x
2. Step 2: Convert to fraction form
   12,321.60/16,986.24 = 7,602.72/x
3. Step 3: Cross multiply
   12,321.60x = 16,986.24 × 7,602.72
4. Step 4: Simplify right side
   12,321.60x = 129,141,626.57
5. Step 5: Solve for x
   x = 129,141,626.57/12,321.60
6. Step 6: Final answer
   x = 10,480.91