Finding the Third Proportional to 2,171.81 and 3,318.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.81 : 3,318.47 = 3,318.47 : x
2. Step 2: Convert to fraction form
   2,171.81/3,318.47 = 3,318.47/x
3. Step 3: Cross multiply
   2,171.81x = 3,318.47 × 3,318.47
4. Step 4: Simplify right side
   2,171.81x = 11,012,234.84
5. Step 5: Solve for x
   x = 11,012,234.84/2,171.81
6. Step 6: Final answer
   x = 5,070.53