Finding the Fourth Proportional to 1,292.52, 1,783.98 and 921.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,292.52 : 1,783.98 = 921.54 : x
2. Step 2: Convert to fraction form
   1,292.52/1,783.98 = 921.54/x
3. Step 3: Cross multiply
   1,292.52x = 1,783.98 × 921.54
4. Step 4: Simplify right side
   1,292.52x = 1,644,008.93
5. Step 5: Solve for x
   x = 1,644,008.93/1,292.52
6. Step 6: Final answer
   x = 1,271.94