Finding the Third Proportional to 216,822.50 and 333,688

Step by Step Solution

1. Step 1: Write the proportion equation
   216,822.50 : 333,688 = 333,688 : x
2. Step 2: Convert to fraction form
   216,822.50/333,688 = 333,688/x
3. Step 3: Cross multiply
   216,822.50x = 333,688 × 333,688
4. Step 4: Simplify right side
   216,822.50x = 111,347,681,344
5. Step 5: Solve for x
   x = 111,347,681,344/216,822.50
6. Step 6: Final answer
   x = 513,543.02