Finding the Fourth Proportional to 208,608.69, 287,885.78 and 117,978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   208,608.69 : 287,885.78 = 117,978.27 : x
2. Step 2: Convert to fraction form
   208,608.69/287,885.78 = 117,978.27/x
3. Step 3: Cross multiply
   208,608.69x = 287,885.78 × 117,978.27
4. Step 4: Simplify right side
   208,608.69x = 33,964,265,692.11
5. Step 5: Solve for x
   x = 33,964,265,692.11/208,608.69
6. Step 6: Final answer
   x = 162,813.28