Finding the Third Proportional to 16,890 and 39,099

Step by Step Solution

1. Step 1: Write the proportion equation
   16,890 : 39,099 = 39,099 : x
2. Step 2: Convert to fraction form
   16,890/39,099 = 39,099/x
3. Step 3: Cross multiply
   16,890x = 39,099 × 39,099
4. Step 4: Simplify right side
   16,890x = 1,528,731,801
5. Step 5: Solve for x
   x = 1,528,731,801/16,890
6. Step 6: Final answer
   x = 90,511.06