Finding the Third Proportional to 508,078.50 and 779,685

Step by Step Solution

1. Step 1: Write the proportion equation
   508,078.50 : 779,685 = 779,685 : x
2. Step 2: Convert to fraction form
   508,078.50/779,685 = 779,685/x
3. Step 3: Cross multiply
   508,078.50x = 779,685 × 779,685
4. Step 4: Simplify right side
   508,078.50x = 607,908,699,225
5. Step 5: Solve for x
   x = 607,908,699,225/508,078.50
6. Step 6: Final answer
   x = 1,196,485.78