Finding the Fourth Proportional to 1,393.26, 1,922.72 and 763.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.26 : 1,922.72 = 763.80 : x
2. Step 2: Convert to fraction form
   1,393.26/1,922.72 = 763.80/x
3. Step 3: Cross multiply
   1,393.26x = 1,922.72 × 763.80
4. Step 4: Simplify right side
   1,393.26x = 1,468,569.72
5. Step 5: Solve for x
   x = 1,468,569.72/1,393.26
6. Step 6: Final answer
   x = 1,054.05