Finding the Third Proportional to 315,522 and 425,142

Step by Step Solution

1. Step 1: Write the proportion equation
   315,522 : 425,142 = 425,142 : x
2. Step 2: Convert to fraction form
   315,522/425,142 = 425,142/x
3. Step 3: Cross multiply
   315,522x = 425,142 × 425,142
4. Step 4: Simplify right side
   315,522x = 180,745,720,164
5. Step 5: Solve for x
   x = 180,745,720,164/315,522
6. Step 6: Final answer
   x = 572,846.65