Finding the Fourth Proportional to 1,393.34, 1,922.80 and 763.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.34 : 1,922.80 = 763.89 : x
2. Step 2: Convert to fraction form
   1,393.34/1,922.80 = 763.89/x
3. Step 3: Cross multiply
   1,393.34x = 1,922.80 × 763.89
4. Step 4: Simplify right side
   1,393.34x = 1,468,801.47
5. Step 5: Solve for x
   x = 1,468,801.47/1,393.34
6. Step 6: Final answer
   x = 1,054.16