Finding the Fourth Proportional to 12,381.57, 17,100.05 and 8,409.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381.57 : 17,100.05 = 8,409.33 : x
2. Step 2: Convert to fraction form
   12,381.57/17,100.05 = 8,409.33/x
3. Step 3: Cross multiply
   12,381.57x = 17,100.05 × 8,409.33
4. Step 4: Simplify right side
   12,381.57x = 143,799,921.42
5. Step 5: Solve for x
   x = 143,799,921.42/12,381.57
6. Step 6: Final answer
   x = 11,614.03