Finding the Fourth Proportional to 2,648.41, 3,972.69 and 1,261.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.41 : 3,972.69 = 1,261.89 : x
2. Step 2: Convert to fraction form
   2,648.41/3,972.69 = 1,261.89/x
3. Step 3: Cross multiply
   2,648.41x = 3,972.69 × 1,261.89
4. Step 4: Simplify right side
   2,648.41x = 5,013,097.78
5. Step 5: Solve for x
   x = 5,013,097.78/2,648.41
6. Step 6: Final answer
   x = 1,892.87