Finding the Fourth Proportional to 1,392.02, 1,920.98 and 762.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.02 : 1,920.98 = 762.55 : x
2. Step 2: Convert to fraction form
   1,392.02/1,920.98 = 762.55/x
3. Step 3: Cross multiply
   1,392.02x = 1,920.98 × 762.55
4. Step 4: Simplify right side
   1,392.02x = 1,464,836.45
5. Step 5: Solve for x
   x = 1,464,836.45/1,392.02
6. Step 6: Final answer
   x = 1,052.31