Finding the Fourth Proportional to 3,276.20, 4,915.17 and 1,085.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,276.20 : 4,915.17 = 1,085.15 : x
2. Step 2: Convert to fraction form
   3,276.20/4,915.17 = 1,085.15/x
3. Step 3: Cross multiply
   3,276.20x = 4,915.17 × 1,085.15
4. Step 4: Simplify right side
   3,276.20x = 5,333,672.15
5. Step 5: Solve for x
   x = 5,333,672.15/3,276.20
6. Step 6: Final answer
   x = 1,628.01