Finding the Third Proportional to 17,664 and 39,990

Step by Step Solution

1. Step 1: Write the proportion equation
   17,664 : 39,990 = 39,990 : x
2. Step 2: Convert to fraction form
   17,664/39,990 = 39,990/x
3. Step 3: Cross multiply
   17,664x = 39,990 × 39,990
4. Step 4: Simplify right side
   17,664x = 1,599,200,100
5. Step 5: Solve for x
   x = 1,599,200,100/17,664
6. Step 6: Final answer
   x = 90,534.43