Finding the Fourth Proportional to 39,726.72, 54,822.96 and 21,822.06

Step by Step Solution

1. Step 1: Write the proportion equation
   39,726.72 : 54,822.96 = 21,822.06 : x
2. Step 2: Convert to fraction form
   39,726.72/54,822.96 = 21,822.06/x
3. Step 3: Cross multiply
   39,726.72x = 54,822.96 × 21,822.06
4. Step 4: Simplify right side
   39,726.72x = 1,196,349,922.50
5. Step 5: Solve for x
   x = 1,196,349,922.50/39,726.72
6. Step 6: Final answer
   x = 30,114.49