Finding the Fourth Proportional to 3,113.20, 4,668.72 and 921.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,113.20 : 4,668.72 = 921.34 : x
2. Step 2: Convert to fraction form
   3,113.20/4,668.72 = 921.34/x
3. Step 3: Cross multiply
   3,113.20x = 4,668.72 × 921.34
4. Step 4: Simplify right side
   3,113.20x = 4,301,478.48
5. Step 5: Solve for x
   x = 4,301,478.48/3,113.20
6. Step 6: Final answer
   x = 1,381.69