Finding the Third Proportional to 443,781 and 721,015

Step by Step Solution

1. Step 1: Write the proportion equation
   443,781 : 721,015 = 721,015 : x
2. Step 2: Convert to fraction form
   443,781/721,015 = 721,015/x
3. Step 3: Cross multiply
   443,781x = 721,015 × 721,015
4. Step 4: Simplify right side
   443,781x = 519,862,630,225
5. Step 5: Solve for x
   x = 519,862,630,225/443,781
6. Step 6: Final answer
   x = 1,171,439.58