Finding the Third Proportional to 12,210 and 18,347.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210 : 18,347.50 = 18,347.50 : x
2. Step 2: Convert to fraction form
   12,210/18,347.50 = 18,347.50/x
3. Step 3: Cross multiply
   12,210x = 18,347.50 × 18,347.50
4. Step 4: Simplify right side
   12,210x = 336,630,756.25
5. Step 5: Solve for x
   x = 336,630,756.25/12,210
6. Step 6: Final answer
   x = 27,570.09