Finding the Fourth Proportional to 1,393.25, 1,922.82 and 772.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.25 : 1,922.82 = 772.25 : x
2. Step 2: Convert to fraction form
   1,393.25/1,922.82 = 772.25/x
3. Step 3: Cross multiply
   1,393.25x = 1,922.82 × 772.25
4. Step 4: Simplify right side
   1,393.25x = 1,484,897.75
5. Step 5: Solve for x
   x = 1,484,897.75/1,393.25
6. Step 6: Final answer
   x = 1,065.78