Finding the Fourth Proportional to 1,392.25, 1,921.43 and 771.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.25 : 1,921.43 = 771.37 : x
2. Step 2: Convert to fraction form
   1,392.25/1,921.43 = 771.37/x
3. Step 3: Cross multiply
   1,392.25x = 1,921.43 × 771.37
4. Step 4: Simplify right side
   1,392.25x = 1,482,133.46
5. Step 5: Solve for x
   x = 1,482,133.46/1,392.25
6. Step 6: Final answer
   x = 1,064.56