Finding the Fourth Proportional to 1,627.38, 2,443.23 and 858.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,627.38 : 2,443.23 = 858.42 : x
2. Step 2: Convert to fraction form
   1,627.38/2,443.23 = 858.42/x
3. Step 3: Cross multiply
   1,627.38x = 2,443.23 × 858.42
4. Step 4: Simplify right side
   1,627.38x = 2,097,317.50
5. Step 5: Solve for x
   x = 2,097,317.50/1,627.38
6. Step 6: Final answer
   x = 1,288.77