Finding the Fourth Proportional to 2,648.93, 3,970.89 and 1,261.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.93 : 3,970.89 = 1,261.53 : x
2. Step 2: Convert to fraction form
   2,648.93/3,970.89 = 1,261.53/x
3. Step 3: Cross multiply
   2,648.93x = 3,970.89 × 1,261.53
4. Step 4: Simplify right side
   2,648.93x = 5,009,396.86
5. Step 5: Solve for x
   x = 5,009,396.86/2,648.93
6. Step 6: Final answer
   x = 1,891.11