Finding the Third Proportional to 774,780 and 1,686,800

Step by Step Solution

1. Step 1: Write the proportion equation
   774,780 : 1,686,800 = 1,686,800 : x
2. Step 2: Convert to fraction form
   774,780/1,686,800 = 1,686,800/x
3. Step 3: Cross multiply
   774,780x = 1,686,800 × 1,686,800
4. Step 4: Simplify right side
   774,780x = 2,845,294,240,000
5. Step 5: Solve for x
   x = 2,845,294,240,000/774,780
6. Step 6: Final answer
   x = 3,672,389.89