Finding the Fourth Proportional to 12,835.98, 17,707.20 and 8,859.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,835.98 : 17,707.20 = 8,859.30 : x
2. Step 2: Convert to fraction form
   12,835.98/17,707.20 = 8,859.30/x
3. Step 3: Cross multiply
   12,835.98x = 17,707.20 × 8,859.30
4. Step 4: Simplify right side
   12,835.98x = 156,873,396.96
5. Step 5: Solve for x
   x = 156,873,396.96/12,835.98
6. Step 6: Final answer
   x = 12,221.38