Finding the Fourth Proportional to 12,788.15, 17,640.18 and 8,809.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788.15 : 17,640.18 = 8,809.02 : x
2. Step 2: Convert to fraction form
   12,788.15/17,640.18 = 8,809.02/x
3. Step 3: Cross multiply
   12,788.15x = 17,640.18 × 8,809.02
4. Step 4: Simplify right side
   12,788.15x = 155,392,698.42
5. Step 5: Solve for x
   x = 155,392,698.42/12,788.15
6. Step 6: Final answer
   x = 12,151.31