Finding the Fourth Proportional to 8,142.78, 12,215.82 and 2,948.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,142.78 : 12,215.82 = 2,948.28 : x
2. Step 2: Convert to fraction form
   8,142.78/12,215.82 = 2,948.28/x
3. Step 3: Cross multiply
   8,142.78x = 12,215.82 × 2,948.28
4. Step 4: Simplify right side
   8,142.78x = 36,015,657.79
5. Step 5: Solve for x
   x = 36,015,657.79/8,142.78
6. Step 6: Final answer
   x = 4,423.02