Finding the Third Proportional to 18,390.94 and 39,697.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18,390.94 : 39,697.31 = 39,697.31 : x
2. Step 2: Convert to fraction form
   18,390.94/39,697.31 = 39,697.31/x
3. Step 3: Cross multiply
   18,390.94x = 39,697.31 × 39,697.31
4. Step 4: Simplify right side
   18,390.94x = 1,575,876,619.72
5. Step 5: Solve for x
   x = 1,575,876,619.72/18,390.94
6. Step 6: Final answer
   x = 85,687.67