Finding the Fourth Proportional to 105,317.98, 145,338.80 and 57,571.52

Step by Step Solution

1. Step 1: Write the proportion equation
   105,317.98 : 145,338.80 = 57,571.52 : x
2. Step 2: Convert to fraction form
   105,317.98/145,338.80 = 57,571.52/x
3. Step 3: Cross multiply
   105,317.98x = 145,338.80 × 57,571.52
4. Step 4: Simplify right side
   105,317.98x = 8,367,375,630.98
5. Step 5: Solve for x
   x = 8,367,375,630.98/105,317.98
6. Step 6: Final answer
   x = 79,448.69