Finding the Fourth Proportional to 2,309.80, 3,187.50 and 1,315.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.80 : 3,187.50 = 1,315.09 : x
2. Step 2: Convert to fraction form
   2,309.80/3,187.50 = 1,315.09/x
3. Step 3: Cross multiply
   2,309.80x = 3,187.50 × 1,315.09
4. Step 4: Simplify right side
   2,309.80x = 4,191,849.38
5. Step 5: Solve for x
   x = 4,191,849.38/2,309.80
6. Step 6: Final answer
   x = 1,814.81