Finding the Fourth Proportional to 2,145.89, 2,960.20 and 1,621.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.89 : 2,960.20 = 1,621.01 : x
2. Step 2: Convert to fraction form
   2,145.89/2,960.20 = 1,621.01/x
3. Step 3: Cross multiply
   2,145.89x = 2,960.20 × 1,621.01
4. Step 4: Simplify right side
   2,145.89x = 4,798,513.80
5. Step 5: Solve for x
   x = 4,798,513.80/2,145.89
6. Step 6: Final answer
   x = 2,236.14