Finding the Third Proportional to 31,440 and 68,410

Step by Step Solution

1. Step 1: Write the proportion equation
   31,440 : 68,410 = 68,410 : x
2. Step 2: Convert to fraction form
   31,440/68,410 = 68,410/x
3. Step 3: Cross multiply
   31,440x = 68,410 × 68,410
4. Step 4: Simplify right side
   31,440x = 4,679,928,100
5. Step 5: Solve for x
   x = 4,679,928,100/31,440
6. Step 6: Final answer
   x = 148,852.67