Finding the Third Proportional to 9,139.50 and 12,948.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.50 : 12,948.75 = 12,948.75 : x
2. Step 2: Convert to fraction form
   9,139.50/12,948.75 = 12,948.75/x
3. Step 3: Cross multiply
   9,139.50x = 12,948.75 × 12,948.75
4. Step 4: Simplify right side
   9,139.50x = 167,670,126.56
5. Step 5: Solve for x
   x = 167,670,126.56/9,139.50
6. Step 6: Final answer
   x = 18,345.66