Finding the Fourth Proportional to 105,597.71, 145,723.62 and 57,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,597.71 : 145,723.62 = 57,198.72 : x
2. Step 2: Convert to fraction form
   105,597.71/145,723.62 = 57,198.72/x
3. Step 3: Cross multiply
   105,597.71x = 145,723.62 × 57,198.72
4. Step 4: Simplify right side
   105,597.71x = 8,335,205,298.73
5. Step 5: Solve for x
   x = 8,335,205,298.73/105,597.71
6. Step 6: Final answer
   x = 78,933.58