Finding the Fourth Proportional to 1,392.54, 1,922.31 and 925.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.54 : 1,922.31 = 925.98 : x
2. Step 2: Convert to fraction form
   1,392.54/1,922.31 = 925.98/x
3. Step 3: Cross multiply
   1,392.54x = 1,922.31 × 925.98
4. Step 4: Simplify right side
   1,392.54x = 1,780,020.61
5. Step 5: Solve for x
   x = 1,780,020.61/1,392.54
6. Step 6: Final answer
   x = 1,278.25