Finding the Third Proportional to 51,786.84 and 79,969.78

Step by Step Solution

1. Step 1: Write the proportion equation
   51,786.84 : 79,969.78 = 79,969.78 : x
2. Step 2: Convert to fraction form
   51,786.84/79,969.78 = 79,969.78/x
3. Step 3: Cross multiply
   51,786.84x = 79,969.78 × 79,969.78
4. Step 4: Simplify right side
   51,786.84x = 6,395,165,913.17
5. Step 5: Solve for x
   x = 6,395,165,913.17/51,786.84
6. Step 6: Final answer
   x = 123,490.17