Finding the Fourth Proportional to 2,103.75, 2,903.24 and 1,172.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.75 : 2,903.24 = 1,172.31 : x
2. Step 2: Convert to fraction form
   2,103.75/2,903.24 = 1,172.31/x
3. Step 3: Cross multiply
   2,103.75x = 2,903.24 × 1,172.31
4. Step 4: Simplify right side
   2,103.75x = 3,403,491.42
5. Step 5: Solve for x
   x = 3,403,491.42/2,103.75
6. Step 6: Final answer
   x = 1,617.82