Finding the Fourth Proportional to 39,731.12, 54,826.24 and 21,826.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,731.12 : 54,826.24 = 21,826.88 : x
2. Step 2: Convert to fraction form
   39,731.12/54,826.24 = 21,826.88/x
3. Step 3: Cross multiply
   39,731.12x = 54,826.24 × 21,826.88
4. Step 4: Simplify right side
   39,731.12x = 1,196,685,761.33
5. Step 5: Solve for x
   x = 1,196,685,761.33/39,731.12
6. Step 6: Final answer
   x = 30,119.61