Finding the Fourth Proportional to 39,869, 55,021.74 and 21,964.04

Step by Step Solution

1. Step 1: Write the proportion equation
   39,869 : 55,021.74 = 21,964.04 : x
2. Step 2: Convert to fraction form
   39,869/55,021.74 = 21,964.04/x
3. Step 3: Cross multiply
   39,869x = 55,021.74 × 21,964.04
4. Step 4: Simplify right side
   39,869x = 1,208,499,698.23
5. Step 5: Solve for x
   x = 1,208,499,698.23/39,869
6. Step 6: Final answer
   x = 30,311.76