Finding the Fourth Proportional to 1,392.86, 1,922.22 and 771.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.86 : 1,922.22 = 771.86 : x
2. Step 2: Convert to fraction form
   1,392.86/1,922.22 = 771.86/x
3. Step 3: Cross multiply
   1,392.86x = 1,922.22 × 771.86
4. Step 4: Simplify right side
   1,392.86x = 1,483,684.73
5. Step 5: Solve for x
   x = 1,483,684.73/1,392.86
6. Step 6: Final answer
   x = 1,065.21