Finding the Fourth Proportional to 1,648.38, 2,274.78 and 985.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.38 : 2,274.78 = 985.53 : x
2. Step 2: Convert to fraction form
   1,648.38/2,274.78 = 985.53/x
3. Step 3: Cross multiply
   1,648.38x = 2,274.78 × 985.53
4. Step 4: Simplify right side
   1,648.38x = 2,241,863.93
5. Step 5: Solve for x
   x = 2,241,863.93/1,648.38
6. Step 6: Final answer
   x = 1,360.04