Finding the Third Proportional to 345,638 and 718,866.50

Step by Step Solution

1. Step 1: Write the proportion equation
   345,638 : 718,866.50 = 718,866.50 : x
2. Step 2: Convert to fraction form
   345,638/718,866.50 = 718,866.50/x
3. Step 3: Cross multiply
   345,638x = 718,866.50 × 718,866.50
4. Step 4: Simplify right side
   345,638x = 516,769,044,822.25
5. Step 5: Solve for x
   x = 516,769,044,822.25/345,638
6. Step 6: Final answer
   x = 1,495,116.41