Finding the Third Proportional to 31,719 and 69,716

Step by Step Solution

1. Step 1: Write the proportion equation
   31,719 : 69,716 = 69,716 : x
2. Step 2: Convert to fraction form
   31,719/69,716 = 69,716/x
3. Step 3: Cross multiply
   31,719x = 69,716 × 69,716
4. Step 4: Simplify right side
   31,719x = 4,860,320,656
5. Step 5: Solve for x
   x = 4,860,320,656/31,719
6. Step 6: Final answer
   x = 153,230.58