Finding the Fourth Proportional to 8,656.18, 12,998.86 and 8,588.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,656.18 : 12,998.86 = 8,588.14 : x
2. Step 2: Convert to fraction form
   8,656.18/12,998.86 = 8,588.14/x
3. Step 3: Cross multiply
   8,656.18x = 12,998.86 × 8,588.14
4. Step 4: Simplify right side
   8,656.18x = 111,636,029.52
5. Step 5: Solve for x
   x = 111,636,029.52/8,656.18
6. Step 6: Final answer
   x = 12,896.69