Finding the Third Proportional to 20,918.81 and 31,869.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,918.81 : 31,869.05 = 31,869.05 : x
2. Step 2: Convert to fraction form
   20,918.81/31,869.05 = 31,869.05/x
3. Step 3: Cross multiply
   20,918.81x = 31,869.05 × 31,869.05
4. Step 4: Simplify right side
   20,918.81x = 1,015,636,148.72
5. Step 5: Solve for x
   x = 1,015,636,148.72/20,918.81
6. Step 6: Final answer
   x = 48,551.33