Finding the Fourth Proportional to 1,648.80, 2,471.52 and 918.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.80 : 2,471.52 = 918.24 : x
2. Step 2: Convert to fraction form
   1,648.80/2,471.52 = 918.24/x
3. Step 3: Cross multiply
   1,648.80x = 2,471.52 × 918.24
4. Step 4: Simplify right side
   1,648.80x = 2,269,448.52
5. Step 5: Solve for x
   x = 2,269,448.52/1,648.80
6. Step 6: Final answer
   x = 1,376.42