Finding the Third Proportional to 308,943 and 721,777.50

Step by Step Solution

1. Step 1: Write the proportion equation
   308,943 : 721,777.50 = 721,777.50 : x
2. Step 2: Convert to fraction form
   308,943/721,777.50 = 721,777.50/x
3. Step 3: Cross multiply
   308,943x = 721,777.50 × 721,777.50
4. Step 4: Simplify right side
   308,943x = 520,962,759,506.25
5. Step 5: Solve for x
   x = 520,962,759,506.25/308,943
6. Step 6: Final answer
   x = 1,686,274.68