Finding the Fourth Proportional to 3,620.63, 4,995.63 and 2,128.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.63 : 4,995.63 = 2,128.61 : x
2. Step 2: Convert to fraction form
   3,620.63/4,995.63 = 2,128.61/x
3. Step 3: Cross multiply
   3,620.63x = 4,995.63 × 2,128.61
4. Step 4: Simplify right side
   3,620.63x = 10,633,723.00
5. Step 5: Solve for x
   x = 10,633,723.00/3,620.63
6. Step 6: Final answer
   x = 2,936.99