Finding the Third Proportional to 90,884.50 and 138,786.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,884.50 : 138,786.50 = 138,786.50 : x
2. Step 2: Convert to fraction form
   90,884.50/138,786.50 = 138,786.50/x
3. Step 3: Cross multiply
   90,884.50x = 138,786.50 × 138,786.50
4. Step 4: Simplify right side
   90,884.50x = 19,261,692,582.25
5. Step 5: Solve for x
   x = 19,261,692,582.25/90,884.50
6. Step 6: Final answer
   x = 211,935.95