Finding the Fourth Proportional to 1,391.67, 1,920.42 and 762.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.67 : 1,920.42 = 762.16 : x
2. Step 2: Convert to fraction form
   1,391.67/1,920.42 = 762.16/x
3. Step 3: Cross multiply
   1,391.67x = 1,920.42 × 762.16
4. Step 4: Simplify right side
   1,391.67x = 1,463,667.31
5. Step 5: Solve for x
   x = 1,463,667.31/1,391.67
6. Step 6: Final answer
   x = 1,051.74