Finding the Fourth Proportional to 57,578.83, 86,371.34 and 18,139.03

Step by Step Solution

1. Step 1: Write the proportion equation
   57,578.83 : 86,371.34 = 18,139.03 : x
2. Step 2: Convert to fraction form
   57,578.83/86,371.34 = 18,139.03/x
3. Step 3: Cross multiply
   57,578.83x = 86,371.34 × 18,139.03
4. Step 4: Simplify right side
   57,578.83x = 1,566,692,020.78
5. Step 5: Solve for x
   x = 1,566,692,020.78/57,578.83
6. Step 6: Final answer
   x = 27,209.52