Finding the Fourth Proportional to 1,648.93, 2,275.73 and 985.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.93 : 2,275.73 = 985.78 : x
2. Step 2: Convert to fraction form
   1,648.93/2,275.73 = 985.78/x
3. Step 3: Cross multiply
   1,648.93x = 2,275.73 × 985.78
4. Step 4: Simplify right side
   1,648.93x = 2,243,369.12
5. Step 5: Solve for x
   x = 2,243,369.12/1,648.93
6. Step 6: Final answer
   x = 1,360.50