Finding the Third Proportional to 51,315.94 and 81,716.88

Step by Step Solution

1. Step 1: Write the proportion equation
   51,315.94 : 81,716.88 = 81,716.88 : x
2. Step 2: Convert to fraction form
   51,315.94/81,716.88 = 81,716.88/x
3. Step 3: Cross multiply
   51,315.94x = 81,716.88 × 81,716.88
4. Step 4: Simplify right side
   51,315.94x = 6,677,647,659.77
5. Step 5: Solve for x
   x = 6,677,647,659.77/51,315.94
6. Step 6: Final answer
   x = 130,128.14