Finding the Fourth Proportional to 144,499.16, 199,411.71 and 87,138.20

Step by Step Solution

1. Step 1: Write the proportion equation
   144,499.16 : 199,411.71 = 87,138.20 : x
2. Step 2: Convert to fraction form
   144,499.16/199,411.71 = 87,138.20/x
3. Step 3: Cross multiply
   144,499.16x = 199,411.71 × 87,138.20
4. Step 4: Simplify right side
   144,499.16x = 17,376,377,468.32
5. Step 5: Solve for x
   x = 17,376,377,468.32/144,499.16
6. Step 6: Final answer
   x = 120,252.45