Finding the Third Proportional to 25,172 and 39,990

Step by Step Solution

1. Step 1: Write the proportion equation
   25,172 : 39,990 = 39,990 : x
2. Step 2: Convert to fraction form
   25,172/39,990 = 39,990/x
3. Step 3: Cross multiply
   25,172x = 39,990 × 39,990
4. Step 4: Simplify right side
   25,172x = 1,599,200,100
5. Step 5: Solve for x
   x = 1,599,200,100/25,172
6. Step 6: Final answer
   x = 63,530.91