Finding the Third Proportional to 339,870.50 and 740,408

Step by Step Solution

1. Step 1: Write the proportion equation
   339,870.50 : 740,408 = 740,408 : x
2. Step 2: Convert to fraction form
   339,870.50/740,408 = 740,408/x
3. Step 3: Cross multiply
   339,870.50x = 740,408 × 740,408
4. Step 4: Simplify right side
   339,870.50x = 548,204,006,464
5. Step 5: Solve for x
   x = 548,204,006,464/339,870.50
6. Step 6: Final answer
   x = 1,612,979.08