Finding the Fourth Proportional to 39,871.41, 55,022.56 and 21,966.36

Step by Step Solution

1. Step 1: Write the proportion equation
   39,871.41 : 55,022.56 = 21,966.36 : x
2. Step 2: Convert to fraction form
   39,871.41/55,022.56 = 21,966.36/x
3. Step 3: Cross multiply
   39,871.41x = 55,022.56 × 21,966.36
4. Step 4: Simplify right side
   39,871.41x = 1,208,645,099.83
5. Step 5: Solve for x
   x = 1,208,645,099.83/39,871.41
6. Step 6: Final answer
   x = 30,313.58