Finding the Third Proportional to 866.81 and 2,104.31

Step by Step Solution

1. Step 1: Write the proportion equation
   866.81 : 2,104.31 = 2,104.31 : x
2. Step 2: Convert to fraction form
   866.81/2,104.31 = 2,104.31/x
3. Step 3: Cross multiply
   866.81x = 2,104.31 × 2,104.31
4. Step 4: Simplify right side
   866.81x = 4,428,131.10
5. Step 5: Solve for x
   x = 4,428,131.10/866.81
6. Step 6: Final answer
   x = 5,108.52