Finding the Fourth Proportional to 2,648.51, 3,974.37 and 918.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.51 : 3,974.37 = 918.35 : x
2. Step 2: Convert to fraction form
   2,648.51/3,974.37 = 918.35/x
3. Step 3: Cross multiply
   2,648.51x = 3,974.37 × 918.35
4. Step 4: Simplify right side
   2,648.51x = 3,649,858.10
5. Step 5: Solve for x
   x = 3,649,858.10/2,648.51
6. Step 6: Final answer
   x = 1,378.08