Finding the Third Proportional to 66,615.22 and 86,426.37

Step by Step Solution

1. Step 1: Write the proportion equation
   66,615.22 : 86,426.37 = 86,426.37 : x
2. Step 2: Convert to fraction form
   66,615.22/86,426.37 = 86,426.37/x
3. Step 3: Cross multiply
   66,615.22x = 86,426.37 × 86,426.37
4. Step 4: Simplify right side
   66,615.22x = 7,469,516,945.23
5. Step 5: Solve for x
   x = 7,469,516,945.23/66,615.22
6. Step 6: Final answer
   x = 112,129.28