Finding the Fourth Proportional to 3,620.16, 4,994.13 and 2,128.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.16 : 4,994.13 = 2,128.05 : x
2. Step 2: Convert to fraction form
   3,620.16/4,994.13 = 2,128.05/x
3. Step 3: Cross multiply
   3,620.16x = 4,994.13 × 2,128.05
4. Step 4: Simplify right side
   3,620.16x = 10,627,758.35
5. Step 5: Solve for x
   x = 10,627,758.35/3,620.16
6. Step 6: Final answer
   x = 2,935.72