Finding the Fourth Proportional to 8,128.15, 12,191.82 and 2,863.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.15 : 12,191.82 = 2,863.42 : x
2. Step 2: Convert to fraction form
   8,128.15/12,191.82 = 2,863.42/x
3. Step 3: Cross multiply
   8,128.15x = 12,191.82 × 2,863.42
4. Step 4: Simplify right side
   8,128.15x = 34,910,301.22
5. Step 5: Solve for x
   x = 34,910,301.22/8,128.15
6. Step 6: Final answer
   x = 4,294.99