Finding the Third Proportional to 66,920.25 and 89,216.25

Step by Step Solution

1. Step 1: Write the proportion equation
   66,920.25 : 89,216.25 = 89,216.25 : x
2. Step 2: Convert to fraction form
   66,920.25/89,216.25 = 89,216.25/x
3. Step 3: Cross multiply
   66,920.25x = 89,216.25 × 89,216.25
4. Step 4: Simplify right side
   66,920.25x = 7,959,539,264.06
5. Step 5: Solve for x
   x = 7,959,539,264.06/66,920.25
6. Step 6: Final answer
   x = 118,940.67