Finding the Third Proportional to 17,781 and 38,910

Step by Step Solution

1. Step 1: Write the proportion equation
   17,781 : 38,910 = 38,910 : x
2. Step 2: Convert to fraction form
   17,781/38,910 = 38,910/x
3. Step 3: Cross multiply
   17,781x = 38,910 × 38,910
4. Step 4: Simplify right side
   17,781x = 1,513,988,100
5. Step 5: Solve for x
   x = 1,513,988,100/17,781
6. Step 6: Final answer
   x = 85,146.40