Finding the Third Proportional to 59,690 and 80,780

Step by Step Solution

1. Step 1: Write the proportion equation
   59,690 : 80,780 = 80,780 : x
2. Step 2: Convert to fraction form
   59,690/80,780 = 80,780/x
3. Step 3: Cross multiply
   59,690x = 80,780 × 80,780
4. Step 4: Simplify right side
   59,690x = 6,525,408,400
5. Step 5: Solve for x
   x = 6,525,408,400/59,690
6. Step 6: Final answer
   x = 109,321.64