Finding the Third Proportional to 12,908 and 31,086

Step by Step Solution

1. Step 1: Write the proportion equation
   12,908 : 31,086 = 31,086 : x
2. Step 2: Convert to fraction form
   12,908/31,086 = 31,086/x
3. Step 3: Cross multiply
   12,908x = 31,086 × 31,086
4. Step 4: Simplify right side
   12,908x = 966,339,396
5. Step 5: Solve for x
   x = 966,339,396/12,908
6. Step 6: Final answer
   x = 74,863.60