Finding the Fourth Proportional to 12,830.72, 17,702.88 and 8,116.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,830.72 : 17,702.88 = 8,116.96 : x
2. Step 2: Convert to fraction form
   12,830.72/17,702.88 = 8,116.96/x
3. Step 3: Cross multiply
   12,830.72x = 17,702.88 × 8,116.96
4. Step 4: Simplify right side
   12,830.72x = 143,693,568.84
5. Step 5: Solve for x
   x = 143,693,568.84/12,830.72
6. Step 6: Final answer
   x = 11,199.18