Finding the Fourth Proportional to 1,391.99, 1,920.93 and 762.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.99 : 1,920.93 = 762.53 : x
2. Step 2: Convert to fraction form
   1,391.99/1,920.93 = 762.53/x
3. Step 3: Cross multiply
   1,391.99x = 1,920.93 × 762.53
4. Step 4: Simplify right side
   1,391.99x = 1,464,766.75
5. Step 5: Solve for x
   x = 1,464,766.75/1,391.99
6. Step 6: Final answer
   x = 1,052.28