Finding the Third Proportional to 310,516.50 and 439,470

Step by Step Solution

1. Step 1: Write the proportion equation
   310,516.50 : 439,470 = 439,470 : x
2. Step 2: Convert to fraction form
   310,516.50/439,470 = 439,470/x
3. Step 3: Cross multiply
   310,516.50x = 439,470 × 439,470
4. Step 4: Simplify right side
   310,516.50x = 193,133,880,900
5. Step 5: Solve for x
   x = 193,133,880,900/310,516.50
6. Step 6: Final answer
   x = 621,976.23