Finding the Fourth Proportional to 2,628.91, 3,945.10 and 1,397.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.91 : 3,945.10 = 1,397.22 : x
2. Step 2: Convert to fraction form
   2,628.91/3,945.10 = 1,397.22/x
3. Step 3: Cross multiply
   2,628.91x = 3,945.10 × 1,397.22
4. Step 4: Simplify right side
   2,628.91x = 5,512,172.62
5. Step 5: Solve for x
   x = 5,512,172.62/2,628.91
6. Step 6: Final answer
   x = 2,096.75