Finding the Fourth Proportional to 208,648.44, 287,859.42 and 137,067.12

Step by Step Solution

1. Step 1: Write the proportion equation
   208,648.44 : 287,859.42 = 137,067.12 : x
2. Step 2: Convert to fraction form
   208,648.44/287,859.42 = 137,067.12/x
3. Step 3: Cross multiply
   208,648.44x = 287,859.42 × 137,067.12
4. Step 4: Simplify right side
   208,648.44x = 39,456,061,664.27
5. Step 5: Solve for x
   x = 39,456,061,664.27/208,648.44
6. Step 6: Final answer
   x = 189,103.08