Finding the Fourth Proportional to 39,976.34, 55,165.89 and 21,826.73

Step by Step Solution

1. Step 1: Write the proportion equation
   39,976.34 : 55,165.89 = 21,826.73 : x
2. Step 2: Convert to fraction form
   39,976.34/55,165.89 = 21,826.73/x
3. Step 3: Cross multiply
   39,976.34x = 55,165.89 × 21,826.73
4. Step 4: Simplify right side
   39,976.34x = 1,204,090,986.24
5. Step 5: Solve for x
   x = 1,204,090,986.24/39,976.34
6. Step 6: Final answer
   x = 30,120.09