Finding the Third Proportional to 323,688 and 490,030

Step by Step Solution

1. Step 1: Write the proportion equation
   323,688 : 490,030 = 490,030 : x
2. Step 2: Convert to fraction form
   323,688/490,030 = 490,030/x
3. Step 3: Cross multiply
   323,688x = 490,030 × 490,030
4. Step 4: Simplify right side
   323,688x = 240,129,400,900
5. Step 5: Solve for x
   x = 240,129,400,900/323,688
6. Step 6: Final answer
   x = 741,854.50