Finding the Third Proportional to 778,670 and 1,689,520

Step by Step Solution

1. Step 1: Write the proportion equation
   778,670 : 1,689,520 = 1,689,520 : x
2. Step 2: Convert to fraction form
   778,670/1,689,520 = 1,689,520/x
3. Step 3: Cross multiply
   778,670x = 1,689,520 × 1,689,520
4. Step 4: Simplify right side
   778,670x = 2,854,477,830,400
5. Step 5: Solve for x
   x = 2,854,477,830,400/778,670
6. Step 6: Final answer
   x = 3,665,837.69