Finding the Fourth Proportional to 208,563.86, 287,806.59 and 117,914.07

Step by Step Solution

1. Step 1: Write the proportion equation
   208,563.86 : 287,806.59 = 117,914.07 : x
2. Step 2: Convert to fraction form
   208,563.86/287,806.59 = 117,914.07/x
3. Step 3: Cross multiply
   208,563.86x = 287,806.59 × 117,914.07
4. Step 4: Simplify right side
   208,563.86x = 33,936,446,399.72
5. Step 5: Solve for x
   x = 33,936,446,399.72/208,563.86
6. Step 6: Final answer
   x = 162,714.90