Finding the Fourth Proportional to 2,648.75, 3,970.54 and 1,261.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.75 : 3,970.54 = 1,261.71 : x
2. Step 2: Convert to fraction form
   2,648.75/3,970.54 = 1,261.71/x
3. Step 3: Cross multiply
   2,648.75x = 3,970.54 × 1,261.71
4. Step 4: Simplify right side
   2,648.75x = 5,009,670.02
5. Step 5: Solve for x
   x = 5,009,670.02/2,648.75
6. Step 6: Final answer
   x = 1,891.33