Finding the Third Proportional to 308,913.75 and 721,710

Step by Step Solution

1. Step 1: Write the proportion equation
   308,913.75 : 721,710 = 721,710 : x
2. Step 2: Convert to fraction form
   308,913.75/721,710 = 721,710/x
3. Step 3: Cross multiply
   308,913.75x = 721,710 × 721,710
4. Step 4: Simplify right side
   308,913.75x = 520,865,324,100
5. Step 5: Solve for x
   x = 520,865,324,100/308,913.75
6. Step 6: Final answer
   x = 1,686,118.94