Finding the Third Proportional to 31,560 and 69,072

Step by Step Solution

1. Step 1: Write the proportion equation
   31,560 : 69,072 = 69,072 : x
2. Step 2: Convert to fraction form
   31,560/69,072 = 69,072/x
3. Step 3: Cross multiply
   31,560x = 69,072 × 69,072
4. Step 4: Simplify right side
   31,560x = 4,770,941,184
5. Step 5: Solve for x
   x = 4,770,941,184/31,560
6. Step 6: Final answer
   x = 151,170.51