Finding the Third Proportional to 18,776.81 and 39,664.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,776.81 : 39,664.69 = 39,664.69 : x
2. Step 2: Convert to fraction form
   18,776.81/39,664.69 = 39,664.69/x
3. Step 3: Cross multiply
   18,776.81x = 39,664.69 × 39,664.69
4. Step 4: Simplify right side
   18,776.81x = 1,573,287,434.47
5. Step 5: Solve for x
   x = 1,573,287,434.47/18,776.81
6. Step 6: Final answer
   x = 83,788.85