Finding the Fourth Proportional to 2,120.04, 2,931.12 and 1,621.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.04 : 2,931.12 = 1,621.89 : x
2. Step 2: Convert to fraction form
   2,120.04/2,931.12 = 1,621.89/x
3. Step 3: Cross multiply
   2,120.04x = 2,931.12 × 1,621.89
4. Step 4: Simplify right side
   2,120.04x = 4,753,954.22
5. Step 5: Solve for x
   x = 4,753,954.22/2,120.04
6. Step 6: Final answer
   x = 2,242.39