Finding the Third Proportional to 31,410 and 67,122

Step by Step Solution

1. Step 1: Write the proportion equation
   31,410 : 67,122 = 67,122 : x
2. Step 2: Convert to fraction form
   31,410/67,122 = 67,122/x
3. Step 3: Cross multiply
   31,410x = 67,122 × 67,122
4. Step 4: Simplify right side
   31,410x = 4,505,362,884
5. Step 5: Solve for x
   x = 4,505,362,884/31,410
6. Step 6: Final answer
   x = 143,437.21