Finding the Fourth Proportional to 3,112.22, 4,668.59 and 921.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.22 : 4,668.59 = 921.07 : x
2. Step 2: Convert to fraction form
   3,112.22/4,668.59 = 921.07/x
3. Step 3: Cross multiply
   3,112.22x = 4,668.59 × 921.07
4. Step 4: Simplify right side
   3,112.22x = 4,300,101.15
5. Step 5: Solve for x
   x = 4,300,101.15/3,112.22
6. Step 6: Final answer
   x = 1,381.68