Finding the Fourth Proportional to 756.27, 1,134.69 and 390.83

Step by Step Solution

1. Step 1: Write the proportion equation
   756.27 : 1,134.69 = 390.83 : x
2. Step 2: Convert to fraction form
   756.27/1,134.69 = 390.83/x
3. Step 3: Cross multiply
   756.27x = 1,134.69 × 390.83
4. Step 4: Simplify right side
   756.27x = 443,470.89
5. Step 5: Solve for x
   x = 443,470.89/756.27
6. Step 6: Final answer
   x = 586.39