Finding the Fourth Proportional to 209,083.82, 288,536.78 and 128,563.94

Step by Step Solution

1. Step 1: Write the proportion equation
   209,083.82 : 288,536.78 = 128,563.94 : x
2. Step 2: Convert to fraction form
   209,083.82/288,536.78 = 128,563.94/x
3. Step 3: Cross multiply
   209,083.82x = 288,536.78 × 128,563.94
4. Step 4: Simplify right side
   209,083.82x = 37,095,426,314.47
5. Step 5: Solve for x
   x = 37,095,426,314.47/209,083.82
6. Step 6: Final answer
   x = 177,418.93