Finding the Fourth Proportional to 144,789.12, 199,806.48 and 81,126.72

Step by Step Solution

1. Step 1: Write the proportion equation
   144,789.12 : 199,806.48 = 81,126.72 : x
2. Step 2: Convert to fraction form
   144,789.12/199,806.48 = 81,126.72/x
3. Step 3: Cross multiply
   144,789.12x = 199,806.48 × 81,126.72
4. Step 4: Simplify right side
   144,789.12x = 16,209,644,357.15
5. Step 5: Solve for x
   x = 16,209,644,357.15/144,789.12
6. Step 6: Final answer
   x = 111,953.47