Finding the Third Proportional to 90,459 and 139,927.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,459 : 139,927.50 = 139,927.50 : x
2. Step 2: Convert to fraction form
   90,459/139,927.50 = 139,927.50/x
3. Step 3: Cross multiply
   90,459x = 139,927.50 × 139,927.50
4. Step 4: Simplify right side
   90,459x = 19,579,705,256.25
5. Step 5: Solve for x
   x = 19,579,705,256.25/90,459
6. Step 6: Final answer
   x = 216,448.39