Finding the Fourth Proportional to 12,433.75, 17,156.98 and 8,409.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,433.75 : 17,156.98 = 8,409.31 : x
2. Step 2: Convert to fraction form
   12,433.75/17,156.98 = 8,409.31/x
3. Step 3: Cross multiply
   12,433.75x = 17,156.98 × 8,409.31
4. Step 4: Simplify right side
   12,433.75x = 144,278,363.48
5. Step 5: Solve for x
   x = 144,278,363.48/12,433.75
6. Step 6: Final answer
   x = 11,603.77