Finding the Fourth Proportional to 1,568.10, 2,164.22 and 904.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.10 : 2,164.22 = 904.90 : x
2. Step 2: Convert to fraction form
   1,568.10/2,164.22 = 904.90/x
3. Step 3: Cross multiply
   1,568.10x = 2,164.22 × 904.90
4. Step 4: Simplify right side
   1,568.10x = 1,958,402.68
5. Step 5: Solve for x
   x = 1,958,402.68/1,568.10
6. Step 6: Final answer
   x = 1,248.90