Finding the Fourth Proportional to 1,568.67, 2,164.81 and 870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.67 : 2,164.81 = 870.05 : x
2. Step 2: Convert to fraction form
   1,568.67/2,164.81 = 870.05/x
3. Step 3: Cross multiply
   1,568.67x = 2,164.81 × 870.05
4. Step 4: Simplify right side
   1,568.67x = 1,883,492.94
5. Step 5: Solve for x
   x = 1,883,492.94/1,568.67
6. Step 6: Final answer
   x = 1,200.69