Finding the Fourth Proportional to 2,152.80, 3,223.72 and 1,805.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.80 : 3,223.72 = 1,805.20 : x
2. Step 2: Convert to fraction form
   2,152.80/3,223.72 = 1,805.20/x
3. Step 3: Cross multiply
   2,152.80x = 3,223.72 × 1,805.20
4. Step 4: Simplify right side
   2,152.80x = 5,819,459.34
5. Step 5: Solve for x
   x = 5,819,459.34/2,152.80
6. Step 6: Final answer
   x = 2,703.20