Finding the Third Proportional to 206,059.50 and 434,259

Step by Step Solution

1. Step 1: Write the proportion equation
   206,059.50 : 434,259 = 434,259 : x
2. Step 2: Convert to fraction form
   206,059.50/434,259 = 434,259/x
3. Step 3: Cross multiply
   206,059.50x = 434,259 × 434,259
4. Step 4: Simplify right side
   206,059.50x = 188,580,879,081
5. Step 5: Solve for x
   x = 188,580,879,081/206,059.50
6. Step 6: Final answer
   x = 915,176.83