Finding the Third Proportional to 87,469 and 139,248.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,469 : 139,248.50 = 139,248.50 : x
2. Step 2: Convert to fraction form
   87,469/139,248.50 = 139,248.50/x
3. Step 3: Cross multiply
   87,469x = 139,248.50 × 139,248.50
4. Step 4: Simplify right side
   87,469x = 19,390,144,752.25
5. Step 5: Solve for x
   x = 19,390,144,752.25/87,469
6. Step 6: Final answer
   x = 221,680.19