Finding the Third Proportional to 9,144.56 and 12,420.84

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.56 : 12,420.84 = 12,420.84 : x
2. Step 2: Convert to fraction form
   9,144.56/12,420.84 = 12,420.84/x
3. Step 3: Cross multiply
   9,144.56x = 12,420.84 × 12,420.84
4. Step 4: Simplify right side
   9,144.56x = 154,277,359.46
5. Step 5: Solve for x
   x = 154,277,359.46/9,144.56
6. Step 6: Final answer
   x = 16,870.94