Finding the Third Proportional to 3,554 and 7,780

Step by Step Solution

1. Step 1: Write the proportion equation
   3,554 : 7,780 = 7,780 : x
2. Step 2: Convert to fraction form
   3,554/7,780 = 7,780/x
3. Step 3: Cross multiply
   3,554x = 7,780 × 7,780
4. Step 4: Simplify right side
   3,554x = 60,528,400
5. Step 5: Solve for x
   x = 60,528,400/3,554
6. Step 6: Final answer
   x = 17,031.06