Finding the Fourth Proportional to 1,629.78, 2,248.98 and 921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,629.78 : 2,248.98 = 921.42 : x
2. Step 2: Convert to fraction form
   1,629.78/2,248.98 = 921.42/x
3. Step 3: Cross multiply
   1,629.78x = 2,248.98 × 921.42
4. Step 4: Simplify right side
   1,629.78x = 2,072,255.15
5. Step 5: Solve for x
   x = 2,072,255.15/1,629.78
6. Step 6: Final answer
   x = 1,271.49