Finding the Third Proportional to 31,437 and 67,428

Step by Step Solution

1. Step 1: Write the proportion equation
   31,437 : 67,428 = 67,428 : x
2. Step 2: Convert to fraction form
   31,437/67,428 = 67,428/x
3. Step 3: Cross multiply
   31,437x = 67,428 × 67,428
4. Step 4: Simplify right side
   31,437x = 4,546,535,184
5. Step 5: Solve for x
   x = 4,546,535,184/31,437
6. Step 6: Final answer
   x = 144,623.70