Finding the Fourth Proportional to 1,568.74, 2,164.91 and 870.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.74 : 2,164.91 = 870.18 : x
2. Step 2: Convert to fraction form
   1,568.74/2,164.91 = 870.18/x
3. Step 3: Cross multiply
   1,568.74x = 2,164.91 × 870.18
4. Step 4: Simplify right side
   1,568.74x = 1,883,861.38
5. Step 5: Solve for x
   x = 1,883,861.38/1,568.74
6. Step 6: Final answer
   x = 1,200.88