Finding the Fourth Proportional to 39,879.83, 55,033.40 and 21,976.49

Step by Step Solution

1. Step 1: Write the proportion equation
   39,879.83 : 55,033.40 = 21,976.49 : x
2. Step 2: Convert to fraction form
   39,879.83/55,033.40 = 21,976.49/x
3. Step 3: Cross multiply
   39,879.83x = 55,033.40 × 21,976.49
4. Step 4: Simplify right side
   39,879.83x = 1,209,440,579.72
5. Step 5: Solve for x
   x = 1,209,440,579.72/39,879.83
6. Step 6: Final answer
   x = 30,327.13