Finding the Third Proportional to 51,005.50 and 71,699.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,005.50 : 71,699.50 = 71,699.50 : x
2. Step 2: Convert to fraction form
   51,005.50/71,699.50 = 71,699.50/x
3. Step 3: Cross multiply
   51,005.50x = 71,699.50 × 71,699.50
4. Step 4: Simplify right side
   51,005.50x = 5,140,818,300.25
5. Step 5: Solve for x
   x = 5,140,818,300.25/51,005.50
6. Step 6: Final answer
   x = 100,789.49