Finding the Fourth Proportional to 208,642.72, 287,963.76 and 123,806.56

Step by Step Solution

1. Step 1: Write the proportion equation
   208,642.72 : 287,963.76 = 123,806.56 : x
2. Step 2: Convert to fraction form
   208,642.72/287,963.76 = 123,806.56/x
3. Step 3: Cross multiply
   208,642.72x = 287,963.76 × 123,806.56
4. Step 4: Simplify right side
   208,642.72x = 35,651,802,530.27
5. Step 5: Solve for x
   x = 35,651,802,530.27/208,642.72
6. Step 6: Final answer
   x = 170,874.89