Finding the Fourth Proportional to 39,895.57, 55,056.27 and 21,991.27

Step by Step Solution

1. Step 1: Write the proportion equation
   39,895.57 : 55,056.27 = 21,991.27 : x
2. Step 2: Convert to fraction form
   39,895.57/55,056.27 = 21,991.27/x
3. Step 3: Cross multiply
   39,895.57x = 55,056.27 × 21,991.27
4. Step 4: Simplify right side
   39,895.57x = 1,210,757,298.76
5. Step 5: Solve for x
   x = 1,210,757,298.76/39,895.57
6. Step 6: Final answer
   x = 30,348.16