Finding the Third Proportional to 216,609 and 334,747.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,609 : 334,747.50 = 334,747.50 : x
2. Step 2: Convert to fraction form
   216,609/334,747.50 = 334,747.50/x
3. Step 3: Cross multiply
   216,609x = 334,747.50 × 334,747.50
4. Step 4: Simplify right side
   216,609x = 112,055,888,756.25
5. Step 5: Solve for x
   x = 112,055,888,756.25/216,609
6. Step 6: Final answer
   x = 517,318.71