Finding the Third Proportional to 581,721 and 1,216,143

Step by Step Solution

1. Step 1: Write the proportion equation
   581,721 : 1,216,143 = 1,216,143 : x
2. Step 2: Convert to fraction form
   581,721/1,216,143 = 1,216,143/x
3. Step 3: Cross multiply
   581,721x = 1,216,143 × 1,216,143
4. Step 4: Simplify right side
   581,721x = 1,479,003,796,449
5. Step 5: Solve for x
   x = 1,479,003,796,449/581,721
6. Step 6: Final answer
   x = 2,542,462.45