Finding the Fourth Proportional to 10,961.17, 15,078.61 and 9,610.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,961.17 : 15,078.61 = 9,610.70 : x
2. Step 2: Convert to fraction form
   10,961.17/15,078.61 = 9,610.70/x
3. Step 3: Cross multiply
   10,961.17x = 15,078.61 × 9,610.70
4. Step 4: Simplify right side
   10,961.17x = 144,915,964.50
5. Step 5: Solve for x
   x = 144,915,964.50/10,961.17
6. Step 6: Final answer
   x = 13,220.84