Finding the Third Proportional to 89,983.50 and 139,691.25

Step by Step Solution

1. Step 1: Write the proportion equation
   89,983.50 : 139,691.25 = 139,691.25 : x
2. Step 2: Convert to fraction form
   89,983.50/139,691.25 = 139,691.25/x
3. Step 3: Cross multiply
   89,983.50x = 139,691.25 × 139,691.25
4. Step 4: Simplify right side
   89,983.50x = 19,513,645,326.56
5. Step 5: Solve for x
   x = 19,513,645,326.56/89,983.50
6. Step 6: Final answer
   x = 216,858.04