Finding the Fourth Proportional to 39,900.56, 55,063.16 and 21,996.28

Step by Step Solution

1. Step 1: Write the proportion equation
   39,900.56 : 55,063.16 = 21,996.28 : x
2. Step 2: Convert to fraction form
   39,900.56/55,063.16 = 21,996.28/x
3. Step 3: Cross multiply
   39,900.56x = 55,063.16 × 21,996.28
4. Step 4: Simplify right side
   39,900.56x = 1,211,184,685.04
5. Step 5: Solve for x
   x = 1,211,184,685.04/39,900.56
6. Step 6: Final answer
   x = 30,355.08