Finding the Fourth Proportional to 1,393.32, 1,922.78 and 763.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.32 : 1,922.78 = 763.88 : x
2. Step 2: Convert to fraction form
   1,393.32/1,922.78 = 763.88/x
3. Step 3: Cross multiply
   1,393.32x = 1,922.78 × 763.88
4. Step 4: Simplify right side
   1,393.32x = 1,468,759.75
5. Step 5: Solve for x
   x = 1,468,759.75/1,393.32
6. Step 6: Final answer
   x = 1,054.14