Finding the Fourth Proportional to 1,568.58, 2,164.69 and 905.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.58 : 2,164.69 = 905.42 : x
2. Step 2: Convert to fraction form
   1,568.58/2,164.69 = 905.42/x
3. Step 3: Cross multiply
   1,568.58x = 2,164.69 × 905.42
4. Step 4: Simplify right side
   1,568.58x = 1,959,953.62
5. Step 5: Solve for x
   x = 1,959,953.62/1,568.58
6. Step 6: Final answer
   x = 1,249.51