Finding the Fourth Proportional to 17,215.50, 23,756.04 and 9,660.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,215.50 : 23,756.04 = 9,660.78 : x
2. Step 2: Convert to fraction form
   17,215.50/23,756.04 = 9,660.78/x
3. Step 3: Cross multiply
   17,215.50x = 23,756.04 × 9,660.78
4. Step 4: Simplify right side
   17,215.50x = 229,501,876.11
5. Step 5: Solve for x
   x = 229,501,876.11/17,215.50
6. Step 6: Final answer
   x = 13,331.12