Finding the Third Proportional to 89,979 and 139,684.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,979 : 139,684.50 = 139,684.50 : x
2. Step 2: Convert to fraction form
   89,979/139,684.50 = 139,684.50/x
3. Step 3: Cross multiply
   89,979x = 139,684.50 × 139,684.50
4. Step 4: Simplify right side
   89,979x = 19,511,759,540.25
5. Step 5: Solve for x
   x = 19,511,759,540.25/89,979
6. Step 6: Final answer
   x = 216,847.93