Finding the Fourth Proportional to 1,393.42, 1,922.82 and 772.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.42 : 1,922.82 = 772.42 : x
2. Step 2: Convert to fraction form
   1,393.42/1,922.82 = 772.42/x
3. Step 3: Cross multiply
   1,393.42x = 1,922.82 × 772.42
4. Step 4: Simplify right side
   1,393.42x = 1,485,224.62
5. Step 5: Solve for x
   x = 1,485,224.62/1,393.42
6. Step 6: Final answer
   x = 1,065.88