Finding the Fourth Proportional to 1,098.52, 1,647.78 and 276.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.52 : 1,647.78 = 276.79 : x
2. Step 2: Convert to fraction form
   1,098.52/1,647.78 = 276.79/x
3. Step 3: Cross multiply
   1,098.52x = 1,647.78 × 276.79
4. Step 4: Simplify right side
   1,098.52x = 456,089.03
5. Step 5: Solve for x
   x = 456,089.03/1,098.52
6. Step 6: Final answer
   x = 415.19