Finding the Fourth Proportional to 2,778.10, 4,156.72 and 1,663.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,778.10 : 4,156.72 = 1,663.42 : x
2. Step 2: Convert to fraction form
   2,778.10/4,156.72 = 1,663.42/x
3. Step 3: Cross multiply
   2,778.10x = 4,156.72 × 1,663.42
4. Step 4: Simplify right side
   2,778.10x = 6,914,371.18
5. Step 5: Solve for x
   x = 6,914,371.18/2,778.10
6. Step 6: Final answer
   x = 2,488.88