Finding the Third Proportional to 858.81 and 1,839.31

Step by Step Solution

1. Step 1: Write the proportion equation
   858.81 : 1,839.31 = 1,839.31 : x
2. Step 2: Convert to fraction form
   858.81/1,839.31 = 1,839.31/x
3. Step 3: Cross multiply
   858.81x = 1,839.31 × 1,839.31
4. Step 4: Simplify right side
   858.81x = 3,383,070.47
5. Step 5: Solve for x
   x = 3,383,070.47/858.81
6. Step 6: Final answer
   x = 3,939.24