Finding the Third Proportional to 356,578 and 783,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,578 : 783,139.50 = 783,139.50 : x
2. Step 2: Convert to fraction form
   356,578/783,139.50 = 783,139.50/x
3. Step 3: Cross multiply
   356,578x = 783,139.50 × 783,139.50
4. Step 4: Simplify right side
   356,578x = 613,307,476,460.25
5. Step 5: Solve for x
   x = 613,307,476,460.25/356,578
6. Step 6: Final answer
   x = 1,719,981.26