Finding the Fourth Proportional to 2,638.78, 3,641.73 and 1,520.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.78 : 3,641.73 = 1,520.08 : x
2. Step 2: Convert to fraction form
   2,638.78/3,641.73 = 1,520.08/x
3. Step 3: Cross multiply
   2,638.78x = 3,641.73 × 1,520.08
4. Step 4: Simplify right side
   2,638.78x = 5,535,720.94
5. Step 5: Solve for x
   x = 5,535,720.94/2,638.78
6. Step 6: Final answer
   x = 2,097.83