Finding the Fourth Proportional to 1,629.38, 2,248.67 and 921.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,629.38 : 2,248.67 = 921.31 : x
2. Step 2: Convert to fraction form
   1,629.38/2,248.67 = 921.31/x
3. Step 3: Cross multiply
   1,629.38x = 2,248.67 × 921.31
4. Step 4: Simplify right side
   1,629.38x = 2,071,722.16
5. Step 5: Solve for x
   x = 2,071,722.16/1,629.38
6. Step 6: Final answer
   x = 1,271.48