Finding the Fourth Proportional to 1,648.89, 2,275.41 and 985.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.89 : 2,275.41 = 985.35 : x
2. Step 2: Convert to fraction form
   1,648.89/2,275.41 = 985.35/x
3. Step 3: Cross multiply
   1,648.89x = 2,275.41 × 985.35
4. Step 4: Simplify right side
   1,648.89x = 2,242,075.24
5. Step 5: Solve for x
   x = 2,242,075.24/1,648.89
6. Step 6: Final answer
   x = 1,359.75