Finding the Fourth Proportional to 3,278.72, 4,916.88 and 1,086.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,278.72 : 4,916.88 = 1,086.80 : x
2. Step 2: Convert to fraction form
   3,278.72/4,916.88 = 1,086.80/x
3. Step 3: Cross multiply
   3,278.72x = 4,916.88 × 1,086.80
4. Step 4: Simplify right side
   3,278.72x = 5,343,665.18
5. Step 5: Solve for x
   x = 5,343,665.18/3,278.72
6. Step 6: Final answer
   x = 1,629.80