Finding the Fourth Proportional to 144,290.72, 216,429.92 and 140,911.80

Step by Step Solution

1. Step 1: Write the proportion equation
   144,290.72 : 216,429.92 = 140,911.80 : x
2. Step 2: Convert to fraction form
   144,290.72/216,429.92 = 140,911.80/x
3. Step 3: Cross multiply
   144,290.72x = 216,429.92 × 140,911.80
4. Step 4: Simplify right side
   144,290.72x = 30,497,529,601.06
5. Step 5: Solve for x
   x = 30,497,529,601.06/144,290.72
6. Step 6: Final answer
   x = 211,361.68