Finding the Fourth Proportional to 104,978.92, 144,870.96 and 57,231.28

Step by Step Solution

1. Step 1: Write the proportion equation
   104,978.92 : 144,870.96 = 57,231.28 : x
2. Step 2: Convert to fraction form
   104,978.92/144,870.96 = 57,231.28/x
3. Step 3: Cross multiply
   104,978.92x = 144,870.96 × 57,231.28
4. Step 4: Simplify right side
   104,978.92x = 8,291,150,475.63
5. Step 5: Solve for x
   x = 8,291,150,475.63/104,978.92
6. Step 6: Final answer
   x = 78,979.19