Finding the Fourth Proportional to 144,393.12, 199,288.32 and 87,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   144,393.12 : 199,288.32 = 87,042.72 : x
2. Step 2: Convert to fraction form
   144,393.12/199,288.32 = 87,042.72/x
3. Step 3: Cross multiply
   144,393.12x = 199,288.32 × 87,042.72
4. Step 4: Simplify right side
   144,393.12x = 17,346,597,437.03
5. Step 5: Solve for x
   x = 17,346,597,437.03/144,393.12
6. Step 6: Final answer
   x = 120,134.51