Finding the Third Proportional to 986.79 and 2,131.71

Step by Step Solution

1. Step 1: Write the proportion equation
   986.79 : 2,131.71 = 2,131.71 : x
2. Step 2: Convert to fraction form
   986.79/2,131.71 = 2,131.71/x
3. Step 3: Cross multiply
   986.79x = 2,131.71 × 2,131.71
4. Step 4: Simplify right side
   986.79x = 4,544,179.03
5. Step 5: Solve for x
   x = 4,544,179.03/986.79
6. Step 6: Final answer
   x = 4,605.00