Finding the Fourth Proportional to 105,162.75, 145,128.03 and 57,419.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,162.75 : 145,128.03 = 57,419.73 : x
2. Step 2: Convert to fraction form
   105,162.75/145,128.03 = 57,419.73/x
3. Step 3: Cross multiply
   105,162.75x = 145,128.03 × 57,419.73
4. Step 4: Simplify right side
   105,162.75x = 8,333,212,298.03
5. Step 5: Solve for x
   x = 8,333,212,298.03/105,162.75
6. Step 6: Final answer
   x = 79,241.10