Finding the Third Proportional to 144,912 and 221,690.25

Step by Step Solution

1. Step 1: Write the proportion equation
   144,912 : 221,690.25 = 221,690.25 : x
2. Step 2: Convert to fraction form
   144,912/221,690.25 = 221,690.25/x
3. Step 3: Cross multiply
   144,912x = 221,690.25 × 221,690.25
4. Step 4: Simplify right side
   144,912x = 49,146,566,945.06
5. Step 5: Solve for x
   x = 49,146,566,945.06/144,912
6. Step 6: Final answer
   x = 339,147.67