Finding the Third Proportional to 851,780 and 1,728,589.50

Step by Step Solution

1. Step 1: Write the proportion equation
   851,780 : 1,728,589.50 = 1,728,589.50 : x
2. Step 2: Convert to fraction form
   851,780/1,728,589.50 = 1,728,589.50/x
3. Step 3: Cross multiply
   851,780x = 1,728,589.50 × 1,728,589.50
4. Step 4: Simplify right side
   851,780x = 2,988,021,659,510.25
5. Step 5: Solve for x
   x = 2,988,021,659,510.25/851,780
6. Step 6: Final answer
   x = 3,507,973.49