Finding the Fourth Proportional to 1,391.63, 1,920.41 and 762.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.63 : 1,920.41 = 762.18 : x
2. Step 2: Convert to fraction form
   1,391.63/1,920.41 = 762.18/x
3. Step 3: Cross multiply
   1,391.63x = 1,920.41 × 762.18
4. Step 4: Simplify right side
   1,391.63x = 1,463,698.04
5. Step 5: Solve for x
   x = 1,463,698.04/1,391.63
6. Step 6: Final answer
   x = 1,051.79