Finding the Fourth Proportional to 105,478.29, 145,554.43 and 57,722.41

Step by Step Solution

1. Step 1: Write the proportion equation
   105,478.29 : 145,554.43 = 57,722.41 : x
2. Step 2: Convert to fraction form
   105,478.29/145,554.43 = 57,722.41/x
3. Step 3: Cross multiply
   105,478.29x = 145,554.43 × 57,722.41
4. Step 4: Simplify right side
   105,478.29x = 8,401,752,485.78
5. Step 5: Solve for x
   x = 8,401,752,485.78/105,478.29
6. Step 6: Final answer
   x = 79,653.86