Finding the Third Proportional to 39,679.88 and 53,890.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,679.88 : 53,890.31 = 53,890.31 : x
2. Step 2: Convert to fraction form
   39,679.88/53,890.31 = 53,890.31/x
3. Step 3: Cross multiply
   39,679.88x = 53,890.31 × 53,890.31
4. Step 4: Simplify right side
   39,679.88x = 2,904,165,781.35
5. Step 5: Solve for x
   x = 2,904,165,781.35/39,679.88
6. Step 6: Final answer
   x = 73,189.89