Finding the Fourth Proportional to 39,857.72, 55,006.15 and 21,952.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,857.72 : 55,006.15 = 21,952.72 : x
2. Step 2: Convert to fraction form
   39,857.72/55,006.15 = 21,952.72/x
3. Step 3: Cross multiply
   39,857.72x = 55,006.15 × 21,952.72
4. Step 4: Simplify right side
   39,857.72x = 1,207,534,664.27
5. Step 5: Solve for x
   x = 1,207,534,664.27/39,857.72
6. Step 6: Final answer
   x = 30,296.13