Finding the Fourth Proportional to 1,648.68, 2,275.08 and 985.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.68 : 2,275.08 = 985.55 : x
2. Step 2: Convert to fraction form
   1,648.68/2,275.08 = 985.55/x
3. Step 3: Cross multiply
   1,648.68x = 2,275.08 × 985.55
4. Step 4: Simplify right side
   1,648.68x = 2,242,193.72
5. Step 5: Solve for x
   x = 2,242,193.72/1,648.68
6. Step 6: Final answer
   x = 1,359.99