Finding the Fourth Proportional to 1,568.02, 2,164.35 and 905.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.02 : 2,164.35 = 905.31 : x
2. Step 2: Convert to fraction form
   1,568.02/2,164.35 = 905.31/x
3. Step 3: Cross multiply
   1,568.02x = 2,164.35 × 905.31
4. Step 4: Simplify right side
   1,568.02x = 1,959,407.70
5. Step 5: Solve for x
   x = 1,959,407.70/1,568.02
6. Step 6: Final answer
   x = 1,249.61