Finding the Third Proportional to 31,379 and 67,120

Step by Step Solution

1. Step 1: Write the proportion equation
   31,379 : 67,120 = 67,120 : x
2. Step 2: Convert to fraction form
   31,379/67,120 = 67,120/x
3. Step 3: Cross multiply
   31,379x = 67,120 × 67,120
4. Step 4: Simplify right side
   31,379x = 4,505,094,400
5. Step 5: Solve for x
   x = 4,505,094,400/31,379
6. Step 6: Final answer
   x = 143,570.36