Finding the Third Proportional to 90,481.50 and 139,963.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,481.50 : 139,963.50 = 139,963.50 : x
2. Step 2: Convert to fraction form
   90,481.50/139,963.50 = 139,963.50/x
3. Step 3: Cross multiply
   90,481.50x = 139,963.50 × 139,963.50
4. Step 4: Simplify right side
   90,481.50x = 19,589,781,332.25
5. Step 5: Solve for x
   x = 19,589,781,332.25/90,481.50
6. Step 6: Final answer
   x = 216,505.93