Finding the Fourth Proportional to 3,620.57, 4,994.64 and 2,128.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.57 : 4,994.64 = 2,128.41 : x
2. Step 2: Convert to fraction form
   3,620.57/4,994.64 = 2,128.41/x
3. Step 3: Cross multiply
   3,620.57x = 4,994.64 × 2,128.41
4. Step 4: Simplify right side
   3,620.57x = 10,630,641.72
5. Step 5: Solve for x
   x = 10,630,641.72/3,620.57
6. Step 6: Final answer
   x = 2,936.18