Finding the Fourth Proportional to 12,815.94, 17,679.24 and 8,830.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.94 : 17,679.24 = 8,830.20 : x
2. Step 2: Convert to fraction form
   12,815.94/17,679.24 = 8,830.20/x
3. Step 3: Cross multiply
   12,815.94x = 17,679.24 × 8,830.20
4. Step 4: Simplify right side
   12,815.94x = 156,111,225.05
5. Step 5: Solve for x
   x = 156,111,225.05/12,815.94
6. Step 6: Final answer
   x = 12,181.02