Finding the Fourth Proportional to 1,568.84, 2,164.98 and 870.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.84 : 2,164.98 = 870.22 : x
2. Step 2: Convert to fraction form
   1,568.84/2,164.98 = 870.22/x
3. Step 3: Cross multiply
   1,568.84x = 2,164.98 × 870.22
4. Step 4: Simplify right side
   1,568.84x = 1,884,008.90
5. Step 5: Solve for x
   x = 1,884,008.90/1,568.84
6. Step 6: Final answer
   x = 1,200.89