Finding the Fourth Proportional to 2,643.22, 3,961.86 and 1,255.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.22 : 3,961.86 = 1,255.42 : x
2. Step 2: Convert to fraction form
   2,643.22/3,961.86 = 1,255.42/x
3. Step 3: Cross multiply
   2,643.22x = 3,961.86 × 1,255.42
4. Step 4: Simplify right side
   2,643.22x = 4,973,798.28
5. Step 5: Solve for x
   x = 4,973,798.28/2,643.22
6. Step 6: Final answer
   x = 1,881.72