Finding the Fourth Proportional to 111,879.33, 168,431.36 and 102,081.57

Step by Step Solution

1. Step 1: Write the proportion equation
   111,879.33 : 168,431.36 = 102,081.57 : x
2. Step 2: Convert to fraction form
   111,879.33/168,431.36 = 102,081.57/x
3. Step 3: Cross multiply
   111,879.33x = 168,431.36 × 102,081.57
4. Step 4: Simplify right side
   111,879.33x = 17,193,737,666.04
5. Step 5: Solve for x
   x = 17,193,737,666.04/111,879.33
6. Step 6: Final answer
   x = 153,681.09