Finding the Fourth Proportional to 1,801.20, 2,700.72 and 828.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.20 : 2,700.72 = 828.12 : x
2. Step 2: Convert to fraction form
   1,801.20/2,700.72 = 828.12/x
3. Step 3: Cross multiply
   1,801.20x = 2,700.72 × 828.12
4. Step 4: Simplify right side
   1,801.20x = 2,236,520.25
5. Step 5: Solve for x
   x = 2,236,520.25/1,801.20
6. Step 6: Final answer
   x = 1,241.68