Finding the Third Proportional to 216,585 and 333,331.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,585 : 333,331.50 = 333,331.50 : x
2. Step 2: Convert to fraction form
   216,585/333,331.50 = 333,331.50/x
3. Step 3: Cross multiply
   216,585x = 333,331.50 × 333,331.50
4. Step 4: Simplify right side
   216,585x = 111,109,888,892.25
5. Step 5: Solve for x
   x = 111,109,888,892.25/216,585
6. Step 6: Final answer
   x = 513,008.24