Finding the Fourth Proportional to 208,512.18, 287,739.81 and 123,578.82

Step by Step Solution

1. Step 1: Write the proportion equation
   208,512.18 : 287,739.81 = 123,578.82 : x
2. Step 2: Convert to fraction form
   208,512.18/287,739.81 = 123,578.82/x
3. Step 3: Cross multiply
   208,512.18x = 287,739.81 × 123,578.82
4. Step 4: Simplify right side
   208,512.18x = 35,558,546,186.82
5. Step 5: Solve for x
   x = 35,558,546,186.82/208,512.18
6. Step 6: Final answer
   x = 170,534.62