Finding the Fourth Proportional to 2,004.78, 3,007.18 and 1,315.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,004.78 : 3,007.18 = 1,315.80 : x
2. Step 2: Convert to fraction form
   2,004.78/3,007.18 = 1,315.80/x
3. Step 3: Cross multiply
   2,004.78x = 3,007.18 × 1,315.80
4. Step 4: Simplify right side
   2,004.78x = 3,956,847.44
5. Step 5: Solve for x
   x = 3,956,847.44/2,004.78
6. Step 6: Final answer
   x = 1,973.71