Finding the Fourth Proportional to 2,638.78, 3,658.18 and 2,498.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.78 : 3,658.18 = 2,498.34 : x
2. Step 2: Convert to fraction form
   2,638.78/3,658.18 = 2,498.34/x
3. Step 3: Cross multiply
   2,638.78x = 3,658.18 × 2,498.34
4. Step 4: Simplify right side
   2,638.78x = 9,139,377.42
5. Step 5: Solve for x
   x = 9,139,377.42/2,638.78
6. Step 6: Final answer
   x = 3,463.49