Finding the Third Proportional to 19,690 and 42,291

Step by Step Solution

1. Step 1: Write the proportion equation
   19,690 : 42,291 = 42,291 : x
2. Step 2: Convert to fraction form
   19,690/42,291 = 42,291/x
3. Step 3: Cross multiply
   19,690x = 42,291 × 42,291
4. Step 4: Simplify right side
   19,690x = 1,788,528,681
5. Step 5: Solve for x
   x = 1,788,528,681/19,690
6. Step 6: Final answer
   x = 90,834.37