Finding the Third Proportional to 345,408 and 743,302.50

Step by Step Solution

1. Step 1: Write the proportion equation
   345,408 : 743,302.50 = 743,302.50 : x
2. Step 2: Convert to fraction form
   345,408/743,302.50 = 743,302.50/x
3. Step 3: Cross multiply
   345,408x = 743,302.50 × 743,302.50
4. Step 4: Simplify right side
   345,408x = 552,498,606,506.25
5. Step 5: Solve for x
   x = 552,498,606,506.25/345,408
6. Step 6: Final answer
   x = 1,599,553.59