Finding the Fourth Proportional to 104,886.42, 144,743.39 and 57,139.89

Step by Step Solution

1. Step 1: Write the proportion equation
   104,886.42 : 144,743.39 = 57,139.89 : x
2. Step 2: Convert to fraction form
   104,886.42/144,743.39 = 57,139.89/x
3. Step 3: Cross multiply
   104,886.42x = 144,743.39 × 57,139.89
4. Step 4: Simplify right side
   104,886.42x = 8,270,621,382.83
5. Step 5: Solve for x
   x = 8,270,621,382.83/104,886.42
6. Step 6: Final answer
   x = 78,853.12