Finding the Third Proportional to 343,564 and 748,121.50

Step by Step Solution

1. Step 1: Write the proportion equation
   343,564 : 748,121.50 = 748,121.50 : x
2. Step 2: Convert to fraction form
   343,564/748,121.50 = 748,121.50/x
3. Step 3: Cross multiply
   343,564x = 748,121.50 × 748,121.50
4. Step 4: Simplify right side
   343,564x = 559,685,778,762.25
5. Step 5: Solve for x
   x = 559,685,778,762.25/343,564
6. Step 6: Final answer
   x = 1,629,058.28