Finding the Fourth Proportional to 57,048.82, 78,743.82 and 40,057.20

Step by Step Solution

1. Step 1: Write the proportion equation
   57,048.82 : 78,743.82 = 40,057.20 : x
2. Step 2: Convert to fraction form
   57,048.82/78,743.82 = 40,057.20/x
3. Step 3: Cross multiply
   57,048.82x = 78,743.82 × 40,057.20
4. Step 4: Simplify right side
   57,048.82x = 3,154,256,946.50
5. Step 5: Solve for x
   x = 3,154,256,946.50/57,048.82
6. Step 6: Final answer
   x = 55,290.49