Finding the Third Proportional to 66,891 and 91,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,891 : 91,109.50 = 91,109.50 : x
2. Step 2: Convert to fraction form
   66,891/91,109.50 = 91,109.50/x
3. Step 3: Cross multiply
   66,891x = 91,109.50 × 91,109.50
4. Step 4: Simplify right side
   66,891x = 8,300,940,990.25
5. Step 5: Solve for x
   x = 8,300,940,990.25/66,891
6. Step 6: Final answer
   x = 124,096.53