Finding the Fourth Proportional to 1,861.38, 2,568.78 and 1,022.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.38 : 2,568.78 = 1,022.12 : x
2. Step 2: Convert to fraction form
   1,861.38/2,568.78 = 1,022.12/x
3. Step 3: Cross multiply
   1,861.38x = 2,568.78 × 1,022.12
4. Step 4: Simplify right side
   1,861.38x = 2,625,583.46
5. Step 5: Solve for x
   x = 2,625,583.46/1,861.38
6. Step 6: Final answer
   x = 1,410.56