Finding the Fourth Proportional to 105,439.98, 145,505.94 and 57,692.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,439.98 : 145,505.94 = 57,692.82 : x
2. Step 2: Convert to fraction form
   105,439.98/145,505.94 = 57,692.82/x
3. Step 3: Cross multiply
   105,439.98x = 145,505.94 × 57,692.82
4. Step 4: Simplify right side
   105,439.98x = 8,394,648,005.35
5. Step 5: Solve for x
   x = 8,394,648,005.35/105,439.98
6. Step 6: Final answer
   x = 79,615.42