Finding the Fourth Proportional to 144,498.16, 199,410.33 and 87,137.20

Step by Step Solution

1. Step 1: Write the proportion equation
   144,498.16 : 199,410.33 = 87,137.20 : x
2. Step 2: Convert to fraction form
   144,498.16/199,410.33 = 87,137.20/x
3. Step 3: Cross multiply
   144,498.16x = 199,410.33 × 87,137.20
4. Step 4: Simplify right side
   144,498.16x = 17,376,057,807.28
5. Step 5: Solve for x
   x = 17,376,057,807.28/144,498.16
6. Step 6: Final answer
   x = 120,251.07