Finding the Fourth Proportional to 2,309.82, 3,187.42 and 1,315.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.82 : 3,187.42 = 1,315.09 : x
2. Step 2: Convert to fraction form
   2,309.82/3,187.42 = 1,315.09/x
3. Step 3: Cross multiply
   2,309.82x = 3,187.42 × 1,315.09
4. Step 4: Simplify right side
   2,309.82x = 4,191,744.17
5. Step 5: Solve for x
   x = 4,191,744.17/2,309.82
6. Step 6: Final answer
   x = 1,814.75