Finding the Fourth Proportional to 105,185.34, 145,157.85 and 57,440.52

Step by Step Solution

1. Step 1: Write the proportion equation
   105,185.34 : 145,157.85 = 57,440.52 : x
2. Step 2: Convert to fraction form
   105,185.34/145,157.85 = 57,440.52/x
3. Step 3: Cross multiply
   105,185.34x = 145,157.85 × 57,440.52
4. Step 4: Simplify right side
   105,185.34x = 8,337,942,386.08
5. Step 5: Solve for x
   x = 8,337,942,386.08/105,185.34
6. Step 6: Final answer
   x = 79,269.05