Finding the Third Proportional to 7,479 and 12,418.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,479 : 12,418.50 = 12,418.50 : x
2. Step 2: Convert to fraction form
   7,479/12,418.50 = 12,418.50/x
3. Step 3: Cross multiply
   7,479x = 12,418.50 × 12,418.50
4. Step 4: Simplify right side
   7,479x = 154,219,142.25
5. Step 5: Solve for x
   x = 154,219,142.25/7,479
6. Step 6: Final answer
   x = 20,620.29