Finding the Fourth Proportional to 12,838.40, 17,707.52 and 8,118.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,838.40 : 17,707.52 = 8,118.12 : x
2. Step 2: Convert to fraction form
   12,838.40/17,707.52 = 8,118.12/x
3. Step 3: Cross multiply
   12,838.40x = 17,707.52 × 8,118.12
4. Step 4: Simplify right side
   12,838.40x = 143,751,772.26
5. Step 5: Solve for x
   x = 143,751,772.26/12,838.40
6. Step 6: Final answer
   x = 11,197.02