Finding the Third Proportional to 31,286.25 and 64,790.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,286.25 : 64,790.25 = 64,790.25 : x
2. Step 2: Convert to fraction form
   31,286.25/64,790.25 = 64,790.25/x
3. Step 3: Cross multiply
   31,286.25x = 64,790.25 × 64,790.25
4. Step 4: Simplify right side
   31,286.25x = 4,197,776,495.06
5. Step 5: Solve for x
   x = 4,197,776,495.06/31,286.25
6. Step 6: Final answer
   x = 134,173.21