Finding the Third Proportional to 3,988.25 and 8,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.25 : 8,780.50 = 8,780.50 : x
2. Step 2: Convert to fraction form
   3,988.25/8,780.50 = 8,780.50/x
3. Step 3: Cross multiply
   3,988.25x = 8,780.50 × 8,780.50
4. Step 4: Simplify right side
   3,988.25x = 77,097,180.25
5. Step 5: Solve for x
   x = 77,097,180.25/3,988.25
6. Step 6: Final answer
   x = 19,331.08