Finding the Fourth Proportional to 2,103.72, 2,903.28 and 1,172.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.72 : 2,903.28 = 1,172.22 : x
2. Step 2: Convert to fraction form
   2,103.72/2,903.28 = 1,172.22/x
3. Step 3: Cross multiply
   2,103.72x = 2,903.28 × 1,172.22
4. Step 4: Simplify right side
   2,103.72x = 3,403,282.88
5. Step 5: Solve for x
   x = 3,403,282.88/2,103.72
6. Step 6: Final answer
   x = 1,617.75