Finding the Third Proportional to 139,417.50 and 221,589

Step by Step Solution

1. Step 1: Write the proportion equation
   139,417.50 : 221,589 = 221,589 : x
2. Step 2: Convert to fraction form
   139,417.50/221,589 = 221,589/x
3. Step 3: Cross multiply
   139,417.50x = 221,589 × 221,589
4. Step 4: Simplify right side
   139,417.50x = 49,101,684,921
5. Step 5: Solve for x
   x = 49,101,684,921/139,417.50
6. Step 6: Final answer
   x = 352,191.69