Finding the Fourth Proportional to 1,393.30, 1,922.77 and 763.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.30 : 1,922.77 = 763.81 : x
2. Step 2: Convert to fraction form
   1,393.30/1,922.77 = 763.81/x
3. Step 3: Cross multiply
   1,393.30x = 1,922.77 × 763.81
4. Step 4: Simplify right side
   1,393.30x = 1,468,630.95
5. Step 5: Solve for x
   x = 1,468,630.95/1,393.30
6. Step 6: Final answer
   x = 1,054.07