Finding the Fourth Proportional to 39,726.72, 54,823.52 and 21,823.40

Step by Step Solution

1. Step 1: Write the proportion equation
   39,726.72 : 54,823.52 = 21,823.40 : x
2. Step 2: Convert to fraction form
   39,726.72/54,823.52 = 21,823.40/x
3. Step 3: Cross multiply
   39,726.72x = 54,823.52 × 21,823.40
4. Step 4: Simplify right side
   39,726.72x = 1,196,435,606.37
5. Step 5: Solve for x
   x = 1,196,435,606.37/39,726.72
6. Step 6: Final answer
   x = 30,116.65