Finding the Fourth Proportional to 1,921.50, 2,880.54 and 1,098.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.50 : 2,880.54 = 1,098.59 : x
2. Step 2: Convert to fraction form
   1,921.50/2,880.54 = 1,098.59/x
3. Step 3: Cross multiply
   1,921.50x = 2,880.54 × 1,098.59
4. Step 4: Simplify right side
   1,921.50x = 3,164,518.04
5. Step 5: Solve for x
   x = 3,164,518.04/1,921.50
6. Step 6: Final answer
   x = 1,646.90