Finding the Third Proportional to 354,399.05 and 777,688.59

Step by Step Solution

1. Step 1: Write the proportion equation
   354,399.05 : 777,688.59 = 777,688.59 : x
2. Step 2: Convert to fraction form
   354,399.05/777,688.59 = 777,688.59/x
3. Step 3: Cross multiply
   354,399.05x = 777,688.59 × 777,688.59
4. Step 4: Simplify right side
   354,399.05x = 604,799,548,848.85
5. Step 5: Solve for x
   x = 604,799,548,848.85/354,399.05
6. Step 6: Final answer
   x = 1,706,549.59