Finding the Fourth Proportional to 1,568.76, 2,164.86 and 870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.76 : 2,164.86 = 870.12 : x
2. Step 2: Convert to fraction form
   1,568.76/2,164.86 = 870.12/x
3. Step 3: Cross multiply
   1,568.76x = 2,164.86 × 870.12
4. Step 4: Simplify right side
   1,568.76x = 1,883,687.98
5. Step 5: Solve for x
   x = 1,883,687.98/1,568.76
6. Step 6: Final answer
   x = 1,200.75