Finding the Third Proportional to 345,213 and 738,403.50

Step by Step Solution

1. Step 1: Write the proportion equation
   345,213 : 738,403.50 = 738,403.50 : x
2. Step 2: Convert to fraction form
   345,213/738,403.50 = 738,403.50/x
3. Step 3: Cross multiply
   345,213x = 738,403.50 × 738,403.50
4. Step 4: Simplify right side
   345,213x = 545,239,728,812.25
5. Step 5: Solve for x
   x = 545,239,728,812.25/345,213
6. Step 6: Final answer
   x = 1,579,429.88