Finding the Third Proportional to 31,851 and 69,240

Step by Step Solution

1. Step 1: Write the proportion equation
   31,851 : 69,240 = 69,240 : x
2. Step 2: Convert to fraction form
   31,851/69,240 = 69,240/x
3. Step 3: Cross multiply
   31,851x = 69,240 × 69,240
4. Step 4: Simplify right side
   31,851x = 4,794,177,600
5. Step 5: Solve for x
   x = 4,794,177,600/31,851
6. Step 6: Final answer
   x = 150,518.90