Finding the Third Proportional to 320,490 and 748,735.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,490 : 748,735.50 = 748,735.50 : x
2. Step 2: Convert to fraction form
   320,490/748,735.50 = 748,735.50/x
3. Step 3: Cross multiply
   320,490x = 748,735.50 × 748,735.50
4. Step 4: Simplify right side
   320,490x = 560,604,848,960.25
5. Step 5: Solve for x
   x = 560,604,848,960.25/320,490
6. Step 6: Final answer
   x = 1,749,211.67