Finding the Fourth Proportional to 42,571.25, 63,798.91 and 20,078.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,571.25 : 63,798.91 = 20,078.42 : x
2. Step 2: Convert to fraction form
   42,571.25/63,798.91 = 20,078.42/x
3. Step 3: Cross multiply
   42,571.25x = 63,798.91 × 20,078.42
4. Step 4: Simplify right side
   42,571.25x = 1,280,981,310.52
5. Step 5: Solve for x
   x = 1,280,981,310.52/42,571.25
6. Step 6: Final answer
   x = 30,090.29