Finding the Third Proportional to 9,057.50 and 12,189.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.50 : 12,189.75 = 12,189.75 : x
2. Step 2: Convert to fraction form
   9,057.50/12,189.75 = 12,189.75/x
3. Step 3: Cross multiply
   9,057.50x = 12,189.75 × 12,189.75
4. Step 4: Simplify right side
   9,057.50x = 148,590,005.06
5. Step 5: Solve for x
   x = 148,590,005.06/9,057.50
6. Step 6: Final answer
   x = 16,405.19