Finding the Fourth Proportional to 1,568.72, 2,164.84 and 870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.72 : 2,164.84 = 870.10 : x
2. Step 2: Convert to fraction form
   1,568.72/2,164.84 = 870.10/x
3. Step 3: Cross multiply
   1,568.72x = 2,164.84 × 870.10
4. Step 4: Simplify right side
   1,568.72x = 1,883,619.70
5. Step 5: Solve for x
   x = 1,883,619.70/1,568.72
6. Step 6: Final answer
   x = 1,200.73