Finding the Fourth Proportional to 208,564.72, 287,815.56 and 117,919.12

Step by Step Solution

1. Step 1: Write the proportion equation
   208,564.72 : 287,815.56 = 117,919.12 : x
2. Step 2: Convert to fraction form
   208,564.72/287,815.56 = 117,919.12/x
3. Step 3: Cross multiply
   208,564.72x = 287,815.56 × 117,919.12
4. Step 4: Simplify right side
   208,564.72x = 33,938,957,557.51
5. Step 5: Solve for x
   x = 33,938,957,557.51/208,564.72
6. Step 6: Final answer
   x = 162,726.26