Finding the Fourth Proportional to 1,392.76, 1,922.05 and 763.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.76 : 1,922.05 = 763.31 : x
2. Step 2: Convert to fraction form
   1,392.76/1,922.05 = 763.31/x
3. Step 3: Cross multiply
   1,392.76x = 1,922.05 × 763.31
4. Step 4: Simplify right side
   1,392.76x = 1,467,131.27
5. Step 5: Solve for x
   x = 1,467,131.27/1,392.76
6. Step 6: Final answer
   x = 1,053.40