Finding the Fourth Proportional to 2,638.82, 3,642.17 and 1,520.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.82 : 3,642.17 = 1,520.40 : x
2. Step 2: Convert to fraction form
   2,638.82/3,642.17 = 1,520.40/x
3. Step 3: Cross multiply
   2,638.82x = 3,642.17 × 1,520.40
4. Step 4: Simplify right side
   2,638.82x = 5,537,555.27
5. Step 5: Solve for x
   x = 5,537,555.27/2,638.82
6. Step 6: Final answer
   x = 2,098.50