Finding the Third Proportional to 12,911.56 and 19,951.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911.56 : 19,951.20 = 19,951.20 : x
2. Step 2: Convert to fraction form
   12,911.56/19,951.20 = 19,951.20/x
3. Step 3: Cross multiply
   12,911.56x = 19,951.20 × 19,951.20
4. Step 4: Simplify right side
   12,911.56x = 398,050,481.17
5. Step 5: Solve for x
   x = 398,050,481.17/12,911.56
6. Step 6: Final answer
   x = 30,828.99