Finding the Fourth Proportional to 1,320.28, 1,821.59 and 1,098.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.28 : 1,821.59 = 1,098.88 : x
2. Step 2: Convert to fraction form
   1,320.28/1,821.59 = 1,098.88/x
3. Step 3: Cross multiply
   1,320.28x = 1,821.59 × 1,098.88
4. Step 4: Simplify right side
   1,320.28x = 2,001,708.82
5. Step 5: Solve for x
   x = 2,001,708.82/1,320.28
6. Step 6: Final answer
   x = 1,516.12