Finding the Third Proportional to 6,621 and 10,615.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,621 : 10,615.50 = 10,615.50 : x
2. Step 2: Convert to fraction form
   6,621/10,615.50 = 10,615.50/x
3. Step 3: Cross multiply
   6,621x = 10,615.50 × 10,615.50
4. Step 4: Simplify right side
   6,621x = 112,688,840.25
5. Step 5: Solve for x
   x = 112,688,840.25/6,621
6. Step 6: Final answer
   x = 17,019.91