Finding the Fourth Proportional to 2,145.79, 3,213.24 and 1,798.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.79 : 3,213.24 = 1,798.21 : x
2. Step 2: Convert to fraction form
   2,145.79/3,213.24 = 1,798.21/x
3. Step 3: Cross multiply
   2,145.79x = 3,213.24 × 1,798.21
4. Step 4: Simplify right side
   2,145.79x = 5,778,080.30
5. Step 5: Solve for x
   x = 5,778,080.30/2,145.79
6. Step 6: Final answer
   x = 2,692.75