Finding the Third Proportional to 89,710.50 and 139,305

Step by Step Solution

1. Step 1: Write the proportion equation
   89,710.50 : 139,305 = 139,305 : x
2. Step 2: Convert to fraction form
   89,710.50/139,305 = 139,305/x
3. Step 3: Cross multiply
   89,710.50x = 139,305 × 139,305
4. Step 4: Simplify right side
   89,710.50x = 19,405,883,025
5. Step 5: Solve for x
   x = 19,405,883,025/89,710.50
6. Step 6: Final answer
   x = 216,316.74