Finding the Fourth Proportional to 1,399.62, 2,099.56 and 851.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.62 : 2,099.56 = 851.52 : x
2. Step 2: Convert to fraction form
   1,399.62/2,099.56 = 851.52/x
3. Step 3: Cross multiply
   1,399.62x = 2,099.56 × 851.52
4. Step 4: Simplify right side
   1,399.62x = 1,787,817.33
5. Step 5: Solve for x
   x = 1,787,817.33/1,399.62
6. Step 6: Final answer
   x = 1,277.36