Finding the Fourth Proportional to 2,648.54, 3,969.96 and 1,261

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.54 : 3,969.96 = 1,261 : x
2. Step 2: Convert to fraction form
   2,648.54/3,969.96 = 1,261/x
3. Step 3: Cross multiply
   2,648.54x = 3,969.96 × 1,261
4. Step 4: Simplify right side
   2,648.54x = 5,006,119.56
5. Step 5: Solve for x
   x = 5,006,119.56/2,648.54
6. Step 6: Final answer
   x = 1,890.14