Finding the Third Proportional to 51,355.69 and 81,488.53

Step by Step Solution

1. Step 1: Write the proportion equation
   51,355.69 : 81,488.53 = 81,488.53 : x
2. Step 2: Convert to fraction form
   51,355.69/81,488.53 = 81,488.53/x
3. Step 3: Cross multiply
   51,355.69x = 81,488.53 × 81,488.53
4. Step 4: Simplify right side
   51,355.69x = 6,640,380,725.28
5. Step 5: Solve for x
   x = 6,640,380,725.28/51,355.69
6. Step 6: Final answer
   x = 129,301.76