Finding the Fourth Proportional to 1,392.82, 1,922.09 and 771.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.82 : 1,922.09 = 771.82 : x
2. Step 2: Convert to fraction form
   1,392.82/1,922.09 = 771.82/x
3. Step 3: Cross multiply
   1,392.82x = 1,922.09 × 771.82
4. Step 4: Simplify right side
   1,392.82x = 1,483,507.50
5. Step 5: Solve for x
   x = 1,483,507.50/1,392.82
6. Step 6: Final answer
   x = 1,065.11