Finding the Fourth Proportional to 1,648.91, 2,275.30 and 985.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.91 : 2,275.30 = 985.61 : x
2. Step 2: Convert to fraction form
   1,648.91/2,275.30 = 985.61/x
3. Step 3: Cross multiply
   1,648.91x = 2,275.30 × 985.61
4. Step 4: Simplify right side
   1,648.91x = 2,242,558.43
5. Step 5: Solve for x
   x = 2,242,558.43/1,648.91
6. Step 6: Final answer
   x = 1,360.02