Finding the Fourth Proportional to 2,309.95, 3,187.38 and 1,315.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.95 : 3,187.38 = 1,315.18 : x
2. Step 2: Convert to fraction form
   2,309.95/3,187.38 = 1,315.18/x
3. Step 3: Cross multiply
   2,309.95x = 3,187.38 × 1,315.18
4. Step 4: Simplify right side
   2,309.95x = 4,191,978.43
5. Step 5: Solve for x
   x = 4,191,978.43/2,309.95
6. Step 6: Final answer
   x = 1,814.75