Finding the Fourth Proportional to 1,568.21, 2,164.20 and 869.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.21 : 2,164.20 = 869.54 : x
2. Step 2: Convert to fraction form
   1,568.21/2,164.20 = 869.54/x
3. Step 3: Cross multiply
   1,568.21x = 2,164.20 × 869.54
4. Step 4: Simplify right side
   1,568.21x = 1,881,858.47
5. Step 5: Solve for x
   x = 1,881,858.47/1,568.21
6. Step 6: Final answer
   x = 1,200.00