Finding the Fourth Proportional to 1,392.57, 1,921.83 and 763.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.57 : 1,921.83 = 763.11 : x
2. Step 2: Convert to fraction form
   1,392.57/1,921.83 = 763.11/x
3. Step 3: Cross multiply
   1,392.57x = 1,921.83 × 763.11
4. Step 4: Simplify right side
   1,392.57x = 1,466,567.69
5. Step 5: Solve for x
   x = 1,466,567.69/1,392.57
6. Step 6: Final answer
   x = 1,053.14