Finding the Third Proportional to 90,994.50 and 139,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,994.50 : 139,042.50 = 139,042.50 : x
2. Step 2: Convert to fraction form
   90,994.50/139,042.50 = 139,042.50/x
3. Step 3: Cross multiply
   90,994.50x = 139,042.50 × 139,042.50
4. Step 4: Simplify right side
   90,994.50x = 19,332,816,806.25
5. Step 5: Solve for x
   x = 19,332,816,806.25/90,994.50
6. Step 6: Final answer
   x = 212,461.38