Finding the Third Proportional to 215,947.69 and 338,728.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,947.69 : 338,728.50 = 338,728.50 : x
2. Step 2: Convert to fraction form
   215,947.69/338,728.50 = 338,728.50/x
3. Step 3: Cross multiply
   215,947.69x = 338,728.50 × 338,728.50
4. Step 4: Simplify right side
   215,947.69x = 114,736,996,712.25
5. Step 5: Solve for x
   x = 114,736,996,712.25/215,947.69
6. Step 6: Final answer
   x = 531,318.48