Finding the Fourth Proportional to 2,103.60, 2,900.04 and 1,317.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.60 : 2,900.04 = 1,317.12 : x
2. Step 2: Convert to fraction form
   2,103.60/2,900.04 = 1,317.12/x
3. Step 3: Cross multiply
   2,103.60x = 2,900.04 × 1,317.12
4. Step 4: Simplify right side
   2,103.60x = 3,819,700.68
5. Step 5: Solve for x
   x = 3,819,700.68/2,103.60
6. Step 6: Final answer
   x = 1,815.79