Finding the Fourth Proportional to 1,568.10, 2,163.51 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.10 : 2,163.51 = 978.42 : x
2. Step 2: Convert to fraction form
   1,568.10/2,163.51 = 978.42/x
3. Step 3: Cross multiply
   1,568.10x = 2,163.51 × 978.42
4. Step 4: Simplify right side
   1,568.10x = 2,116,821.45
5. Step 5: Solve for x
   x = 2,116,821.45/1,568.10
6. Step 6: Final answer
   x = 1,349.93