Finding the Third Proportional to 90,643.50 and 104,791.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,643.50 : 104,791.50 = 104,791.50 : x
2. Step 2: Convert to fraction form
   90,643.50/104,791.50 = 104,791.50/x
3. Step 3: Cross multiply
   90,643.50x = 104,791.50 × 104,791.50
4. Step 4: Simplify right side
   90,643.50x = 10,981,258,472.25
5. Step 5: Solve for x
   x = 10,981,258,472.25/90,643.50
6. Step 6: Final answer
   x = 121,147.78