Finding the Third Proportional to 66,214.50 and 85,018.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,214.50 : 85,018.50 = 85,018.50 : x
2. Step 2: Convert to fraction form
   66,214.50/85,018.50 = 85,018.50/x
3. Step 3: Cross multiply
   66,214.50x = 85,018.50 × 85,018.50
4. Step 4: Simplify right side
   66,214.50x = 7,228,145,342.25
5. Step 5: Solve for x
   x = 7,228,145,342.25/66,214.50
6. Step 6: Final answer
   x = 109,162.58