Finding the Fourth Proportional to 1,648.40, 2,274.72 and 940.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.40 : 2,274.72 = 940.20 : x
2. Step 2: Convert to fraction form
   1,648.40/2,274.72 = 940.20/x
3. Step 3: Cross multiply
   1,648.40x = 2,274.72 × 940.20
4. Step 4: Simplify right side
   1,648.40x = 2,138,691.74
5. Step 5: Solve for x
   x = 2,138,691.74/1,648.40
6. Step 6: Final answer
   x = 1,297.43