Finding the Fourth Proportional to 1,571.36, 2,351.12 and 978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.36 : 2,351.12 = 978.48 : x
2. Step 2: Convert to fraction form
   1,571.36/2,351.12 = 978.48/x
3. Step 3: Cross multiply
   1,571.36x = 2,351.12 × 978.48
4. Step 4: Simplify right side
   1,571.36x = 2,300,523.90
5. Step 5: Solve for x
   x = 2,300,523.90/1,571.36
6. Step 6: Final answer
   x = 1,464.03