Finding the Fourth Proportional to 2,610.90, 3,913.56 and 1,293.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.90 : 3,913.56 = 1,293.30 : x
2. Step 2: Convert to fraction form
   2,610.90/3,913.56 = 1,293.30/x
3. Step 3: Cross multiply
   2,610.90x = 3,913.56 × 1,293.30
4. Step 4: Simplify right side
   2,610.90x = 5,061,407.15
5. Step 5: Solve for x
   x = 5,061,407.15/2,610.90
6. Step 6: Final answer
   x = 1,938.57