Finding the Fourth Proportional to 40,111.95, 55,352.39 and 21,959.20

Step by Step Solution

1. Step 1: Write the proportion equation
   40,111.95 : 55,352.39 = 21,959.20 : x
2. Step 2: Convert to fraction form
   40,111.95/55,352.39 = 21,959.20/x
3. Step 3: Cross multiply
   40,111.95x = 55,352.39 × 21,959.20
4. Step 4: Simplify right side
   40,111.95x = 1,215,494,147.59
5. Step 5: Solve for x
   x = 1,215,494,147.59/40,111.95
6. Step 6: Final answer
   x = 30,302.54