Finding the Fourth Proportional to 2,103.72, 2,903.08 and 1,318.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.72 : 2,903.08 = 1,318.20 : x
2. Step 2: Convert to fraction form
   2,103.72/2,903.08 = 1,318.20/x
3. Step 3: Cross multiply
   2,103.72x = 2,903.08 × 1,318.20
4. Step 4: Simplify right side
   2,103.72x = 3,826,840.06
5. Step 5: Solve for x
   x = 3,826,840.06/2,103.72
6. Step 6: Final answer
   x = 1,819.08