Finding the Fourth Proportional to 12,402.56, 17,105.28 and 8,417.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.56 : 17,105.28 = 8,417.12 : x
2. Step 2: Convert to fraction form
   12,402.56/17,105.28 = 8,417.12/x
3. Step 3: Cross multiply
   12,402.56x = 17,105.28 × 8,417.12
4. Step 4: Simplify right side
   12,402.56x = 143,977,194.39
5. Step 5: Solve for x
   x = 143,977,194.39/12,402.56
6. Step 6: Final answer
   x = 11,608.67