Finding the Fourth Proportional to 12,686.22, 17,509.06 and 8,704.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.22 : 17,509.06 = 8,704.06 : x
2. Step 2: Convert to fraction form
   12,686.22/17,509.06 = 8,704.06/x
3. Step 3: Cross multiply
   12,686.22x = 17,509.06 × 8,704.06
4. Step 4: Simplify right side
   12,686.22x = 152,399,875.89
5. Step 5: Solve for x
   x = 152,399,875.89/12,686.22
6. Step 6: Final answer
   x = 12,013.02