Finding the Third Proportional to 42,531 and 86,790

Step by Step Solution

1. Step 1: Write the proportion equation
   42,531 : 86,790 = 86,790 : x
2. Step 2: Convert to fraction form
   42,531/86,790 = 86,790/x
3. Step 3: Cross multiply
   42,531x = 86,790 × 86,790
4. Step 4: Simplify right side
   42,531x = 7,532,504,100
5. Step 5: Solve for x
   x = 7,532,504,100/42,531
6. Step 6: Final answer
   x = 177,106.21