Finding the Third Proportional to 31,718 and 69,086

Step by Step Solution

1. Step 1: Write the proportion equation
   31,718 : 69,086 = 69,086 : x
2. Step 2: Convert to fraction form
   31,718/69,086 = 69,086/x
3. Step 3: Cross multiply
   31,718x = 69,086 × 69,086
4. Step 4: Simplify right side
   31,718x = 4,772,875,396
5. Step 5: Solve for x
   x = 4,772,875,396/31,718
6. Step 6: Final answer
   x = 150,478.45