Finding the Fourth Proportional to 2,103.79, 2,903.22 and 1,172.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.79 : 2,903.22 = 1,172.29 : x
2. Step 2: Convert to fraction form
   2,103.79/2,903.22 = 1,172.29/x
3. Step 3: Cross multiply
   2,103.79x = 2,903.22 × 1,172.29
4. Step 4: Simplify right side
   2,103.79x = 3,403,401.26
5. Step 5: Solve for x
   x = 3,403,401.26/2,103.79
6. Step 6: Final answer
   x = 1,617.75