Finding the Fourth Proportional to 3,111.71, 4,668.57 and 920.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.71 : 4,668.57 = 920.48 : x
2. Step 2: Convert to fraction form
   3,111.71/4,668.57 = 920.48/x
3. Step 3: Cross multiply
   3,111.71x = 4,668.57 × 920.48
4. Step 4: Simplify right side
   3,111.71x = 4,297,301.97
5. Step 5: Solve for x
   x = 4,297,301.97/3,111.71
6. Step 6: Final answer
   x = 1,381.01