Finding the Fourth Proportional to 2,640.72, 3,955.40 and 1,251.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.72 : 3,955.40 = 1,251.96 : x
2. Step 2: Convert to fraction form
   2,640.72/3,955.40 = 1,251.96/x
3. Step 3: Cross multiply
   2,640.72x = 3,955.40 × 1,251.96
4. Step 4: Simplify right side
   2,640.72x = 4,952,002.58
5. Step 5: Solve for x
   x = 4,952,002.58/2,640.72
6. Step 6: Final answer
   x = 1,875.25