Finding the Fourth Proportional to 1,392.63, 1,921.79 and 763.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.63 : 1,921.79 = 763.18 : x
2. Step 2: Convert to fraction form
   1,392.63/1,921.79 = 763.18/x
3. Step 3: Cross multiply
   1,392.63x = 1,921.79 × 763.18
4. Step 4: Simplify right side
   1,392.63x = 1,466,671.69
5. Step 5: Solve for x
   x = 1,466,671.69/1,392.63
6. Step 6: Final answer
   x = 1,053.17