Finding the Fourth Proportional to 1,568.71, 2,164.89 and 870.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.71 : 2,164.89 = 870.04 : x
2. Step 2: Convert to fraction form
   1,568.71/2,164.89 = 870.04/x
3. Step 3: Cross multiply
   1,568.71x = 2,164.89 × 870.04
4. Step 4: Simplify right side
   1,568.71x = 1,883,540.90
5. Step 5: Solve for x
   x = 1,883,540.90/1,568.71
6. Step 6: Final answer
   x = 1,200.69