Finding the Fourth Proportional to 39,863.30, 55,010.61 and 21,959.96

Step by Step Solution

1. Step 1: Write the proportion equation
   39,863.30 : 55,010.61 = 21,959.96 : x
2. Step 2: Convert to fraction form
   39,863.30/55,010.61 = 21,959.96/x
3. Step 3: Cross multiply
   39,863.30x = 55,010.61 × 21,959.96
4. Step 4: Simplify right side
   39,863.30x = 1,208,030,520.12
5. Step 5: Solve for x
   x = 1,208,030,520.12/39,863.30
6. Step 6: Final answer
   x = 30,304.33