Finding the Third Proportional to 858.09 and 1,908.56

Step by Step Solution

1. Step 1: Write the proportion equation
   858.09 : 1,908.56 = 1,908.56 : x
2. Step 2: Convert to fraction form
   858.09/1,908.56 = 1,908.56/x
3. Step 3: Cross multiply
   858.09x = 1,908.56 × 1,908.56
4. Step 4: Simplify right side
   858.09x = 3,642,610.82
5. Step 5: Solve for x
   x = 3,642,610.82/858.09
6. Step 6: Final answer
   x = 4,245.00