Finding the Fourth Proportional to 3,620.85, 4,995.59 and 2,128.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.85 : 4,995.59 = 2,128.22 : x
2. Step 2: Convert to fraction form
   3,620.85/4,995.59 = 2,128.22/x
3. Step 3: Cross multiply
   3,620.85x = 4,995.59 × 2,128.22
4. Step 4: Simplify right side
   3,620.85x = 10,631,728.76
5. Step 5: Solve for x
   x = 10,631,728.76/3,620.85
6. Step 6: Final answer
   x = 2,936.25