Finding the Third Proportional to 87,889.50 and 139,738.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,889.50 : 139,738.50 = 139,738.50 : x
2. Step 2: Convert to fraction form
   87,889.50/139,738.50 = 139,738.50/x
3. Step 3: Cross multiply
   87,889.50x = 139,738.50 × 139,738.50
4. Step 4: Simplify right side
   87,889.50x = 19,526,848,382.25
5. Step 5: Solve for x
   x = 19,526,848,382.25/87,889.50
6. Step 6: Final answer
   x = 222,174.99