Finding the Fourth Proportional to 2,309.78, 3,187.52 and 1,315.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.78 : 3,187.52 = 1,315.01 : x
2. Step 2: Convert to fraction form
   2,309.78/3,187.52 = 1,315.01/x
3. Step 3: Cross multiply
   2,309.78x = 3,187.52 × 1,315.01
4. Step 4: Simplify right side
   2,309.78x = 4,191,598.16
5. Step 5: Solve for x
   x = 4,191,598.16/2,309.78
6. Step 6: Final answer
   x = 1,814.72