Finding the Third Proportional to 221,742.56 and 486,405

Step by Step Solution

1. Step 1: Write the proportion equation
   221,742.56 : 486,405 = 486,405 : x
2. Step 2: Convert to fraction form
   221,742.56/486,405 = 486,405/x
3. Step 3: Cross multiply
   221,742.56x = 486,405 × 486,405
4. Step 4: Simplify right side
   221,742.56x = 236,589,824,025
5. Step 5: Solve for x
   x = 236,589,824,025/221,742.56
6. Step 6: Final answer
   x = 1,066,957.20