Finding the Fourth Proportional to 105,691.78, 145,853.88 and 57,944.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,691.78 : 145,853.88 = 57,944.30 : x
2. Step 2: Convert to fraction form
   105,691.78/145,853.88 = 57,944.30/x
3. Step 3: Cross multiply
   105,691.78x = 145,853.88 × 57,944.30
4. Step 4: Simplify right side
   105,691.78x = 8,451,400,978.88
5. Step 5: Solve for x
   x = 8,451,400,978.88/105,691.78
6. Step 6: Final answer
   x = 79,962.71