Finding the Fourth Proportional to 3,620.15, 4,994.14 and 2,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.15 : 4,994.14 = 2,128.04 : x
2. Step 2: Convert to fraction form
   3,620.15/4,994.14 = 2,128.04/x
3. Step 3: Cross multiply
   3,620.15x = 4,994.14 × 2,128.04
4. Step 4: Simplify right side
   3,620.15x = 10,627,729.69
5. Step 5: Solve for x
   x = 10,627,729.69/3,620.15
6. Step 6: Final answer
   x = 2,935.72