Finding the Third Proportional to 39,639.38 and 53,809.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,639.38 : 53,809.31 = 53,809.31 : x
2. Step 2: Convert to fraction form
   39,639.38/53,809.31 = 53,809.31/x
3. Step 3: Cross multiply
   39,639.38x = 53,809.31 × 53,809.31
4. Step 4: Simplify right side
   39,639.38x = 2,895,442,111.72
5. Step 5: Solve for x
   x = 2,895,442,111.72/39,639.38
6. Step 6: Final answer
   x = 73,044.60