Finding the Fourth Proportional to 1,392.88, 1,922.12 and 763.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.88 : 1,922.12 = 763.39 : x
2. Step 2: Convert to fraction form
   1,392.88/1,922.12 = 763.39/x
3. Step 3: Cross multiply
   1,392.88x = 1,922.12 × 763.39
4. Step 4: Simplify right side
   1,392.88x = 1,467,322.38
5. Step 5: Solve for x
   x = 1,467,322.38/1,392.88
6. Step 6: Final answer
   x = 1,053.45