Finding the Fourth Proportional to 3,278.78, 4,915.02 and 2,105.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,278.78 : 4,915.02 = 2,105.52 : x
2. Step 2: Convert to fraction form
   3,278.78/4,915.02 = 2,105.52/x
3. Step 3: Cross multiply
   3,278.78x = 4,915.02 × 2,105.52
4. Step 4: Simplify right side
   3,278.78x = 10,348,672.91
5. Step 5: Solve for x
   x = 10,348,672.91/3,278.78
6. Step 6: Final answer
   x = 3,156.26