Finding the Fourth Proportional to 899.52, 1,355.72 and 849.28

Step by Step Solution

1. Step 1: Write the proportion equation
   899.52 : 1,355.72 = 849.28 : x
2. Step 2: Convert to fraction form
   899.52/1,355.72 = 849.28/x
3. Step 3: Cross multiply
   899.52x = 1,355.72 × 849.28
4. Step 4: Simplify right side
   899.52x = 1,151,385.88
5. Step 5: Solve for x
   x = 1,151,385.88/899.52
6. Step 6: Final answer
   x = 1,280.00