Finding the Fourth Proportional to 1,568.18, 2,164.06 and 905.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.18 : 2,164.06 = 905.09 : x
2. Step 2: Convert to fraction form
   1,568.18/2,164.06 = 905.09/x
3. Step 3: Cross multiply
   1,568.18x = 2,164.06 × 905.09
4. Step 4: Simplify right side
   1,568.18x = 1,958,669.07
5. Step 5: Solve for x
   x = 1,958,669.07/1,568.18
6. Step 6: Final answer
   x = 1,249.01