Finding the Third Proportional to 356,619.50 and 777,211

Step by Step Solution

1. Step 1: Write the proportion equation
   356,619.50 : 777,211 = 777,211 : x
2. Step 2: Convert to fraction form
   356,619.50/777,211 = 777,211/x
3. Step 3: Cross multiply
   356,619.50x = 777,211 × 777,211
4. Step 4: Simplify right side
   356,619.50x = 604,056,938,521
5. Step 5: Solve for x
   x = 604,056,938,521/356,619.50
6. Step 6: Final answer
   x = 1,693,841.58