Finding the Fourth Proportional to 144,783.72, 199,809.70 and 81,142.02

Step by Step Solution

1. Step 1: Write the proportion equation
   144,783.72 : 199,809.70 = 81,142.02 : x
2. Step 2: Convert to fraction form
   144,783.72/199,809.70 = 81,142.02/x
3. Step 3: Cross multiply
   144,783.72x = 199,809.70 × 81,142.02
4. Step 4: Simplify right side
   144,783.72x = 16,212,962,673.59
5. Step 5: Solve for x
   x = 16,212,962,673.59/144,783.72
6. Step 6: Final answer
   x = 111,980.56