Finding the Fourth Proportional to 1,568.34, 2,164.50 and 905.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.34 : 2,164.50 = 905.40 : x
2. Step 2: Convert to fraction form
   1,568.34/2,164.50 = 905.40/x
3. Step 3: Cross multiply
   1,568.34x = 2,164.50 × 905.40
4. Step 4: Simplify right side
   1,568.34x = 1,959,738.30
5. Step 5: Solve for x
   x = 1,959,738.30/1,568.34
6. Step 6: Final answer
   x = 1,249.56