Finding the Fourth Proportional to 39,871, 55,020.90 and 21,965.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,871 : 55,020.90 = 21,965.82 : x
2. Step 2: Convert to fraction form
   39,871/55,020.90 = 21,965.82/x
3. Step 3: Cross multiply
   39,871x = 55,020.90 × 21,965.82
4. Step 4: Simplify right side
   39,871x = 1,208,579,185.64
5. Step 5: Solve for x
   x = 1,208,579,185.64/39,871
6. Step 6: Final answer
   x = 30,312.24