Finding the Third Proportional to 355,312 and 777,048.50

Step by Step Solution

1. Step 1: Write the proportion equation
   355,312 : 777,048.50 = 777,048.50 : x
2. Step 2: Convert to fraction form
   355,312/777,048.50 = 777,048.50/x
3. Step 3: Cross multiply
   355,312x = 777,048.50 × 777,048.50
4. Step 4: Simplify right side
   355,312x = 603,804,371,352.25
5. Step 5: Solve for x
   x = 603,804,371,352.25/355,312
6. Step 6: Final answer
   x = 1,699,363.86