Finding the Fourth Proportional to 1,648.83, 2,471.82 and 918.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.83 : 2,471.82 = 918.61 : x
2. Step 2: Convert to fraction form
   1,648.83/2,471.82 = 918.61/x
3. Step 3: Cross multiply
   1,648.83x = 2,471.82 × 918.61
4. Step 4: Simplify right side
   1,648.83x = 2,270,638.57
5. Step 5: Solve for x
   x = 2,270,638.57/1,648.83
6. Step 6: Final answer
   x = 1,377.12