Finding the Third Proportional to 858.09 and 1,871.86

Step by Step Solution

1. Step 1: Write the proportion equation
   858.09 : 1,871.86 = 1,871.86 : x
2. Step 2: Convert to fraction form
   858.09/1,871.86 = 1,871.86/x
3. Step 3: Cross multiply
   858.09x = 1,871.86 × 1,871.86
4. Step 4: Simplify right side
   858.09x = 3,503,857.52
5. Step 5: Solve for x
   x = 3,503,857.52/858.09
6. Step 6: Final answer
   x = 4,083.30