Finding the Third Proportional to 31,311.56 and 63,716.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,311.56 : 63,716.81 = 63,716.81 : x
2. Step 2: Convert to fraction form
   31,311.56/63,716.81 = 63,716.81/x
3. Step 3: Cross multiply
   31,311.56x = 63,716.81 × 63,716.81
4. Step 4: Simplify right side
   31,311.56x = 4,059,832,195.16
5. Step 5: Solve for x
   x = 4,059,832,195.16/31,311.56
6. Step 6: Final answer
   x = 129,659.20