Finding the Fourth Proportional to 1,648.79, 2,275.24 and 985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.79 : 2,275.24 = 985.31 : x
2. Step 2: Convert to fraction form
   1,648.79/2,275.24 = 985.31/x
3. Step 3: Cross multiply
   1,648.79x = 2,275.24 × 985.31
4. Step 4: Simplify right side
   1,648.79x = 2,241,811.80
5. Step 5: Solve for x
   x = 2,241,811.80/1,648.79
6. Step 6: Final answer
   x = 1,359.67