Finding the Fourth Proportional to 12,402.27, 17,124.21 and 8,619.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.27 : 17,124.21 = 8,619.12 : x
2. Step 2: Convert to fraction form
   12,402.27/17,124.21 = 8,619.12/x
3. Step 3: Cross multiply
   12,402.27x = 17,124.21 × 8,619.12
4. Step 4: Simplify right side
   12,402.27x = 147,595,620.90
5. Step 5: Solve for x
   x = 147,595,620.90/12,402.27
6. Step 6: Final answer
   x = 11,900.69