Finding the Fourth Proportional to 10,409.68, 15,605.88 and 7,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,409.68 : 15,605.88 = 7,280.72 : x
2. Step 2: Convert to fraction form
   10,409.68/15,605.88 = 7,280.72/x
3. Step 3: Cross multiply
   10,409.68x = 15,605.88 × 7,280.72
4. Step 4: Simplify right side
   10,409.68x = 113,622,042.63
5. Step 5: Solve for x
   x = 113,622,042.63/10,409.68
6. Step 6: Final answer
   x = 10,915.04