Finding the Third Proportional to 43,139.75 and 67,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   43,139.75 : 67,686.50 = 67,686.50 : x
2. Step 2: Convert to fraction form
   43,139.75/67,686.50 = 67,686.50/x
3. Step 3: Cross multiply
   43,139.75x = 67,686.50 × 67,686.50
4. Step 4: Simplify right side
   43,139.75x = 4,581,462,282.25
5. Step 5: Solve for x
   x = 4,581,462,282.25/43,139.75
6. Step 6: Final answer
   x = 106,200.48