Finding the Third Proportional to 90,370.50 and 139,015.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,370.50 : 139,015.50 = 139,015.50 : x
2. Step 2: Convert to fraction form
   90,370.50/139,015.50 = 139,015.50/x
3. Step 3: Cross multiply
   90,370.50x = 139,015.50 × 139,015.50
4. Step 4: Simplify right side
   90,370.50x = 19,325,309,240.25
5. Step 5: Solve for x
   x = 19,325,309,240.25/90,370.50
6. Step 6: Final answer
   x = 213,845.33