Finding the Fourth Proportional to 1,561.73, 2,155.02 and 898.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.73 : 2,155.02 = 898.52 : x
2. Step 2: Convert to fraction form
   1,561.73/2,155.02 = 898.52/x
3. Step 3: Cross multiply
   1,561.73x = 2,155.02 × 898.52
4. Step 4: Simplify right side
   1,561.73x = 1,936,328.57
5. Step 5: Solve for x
   x = 1,936,328.57/1,561.73
6. Step 6: Final answer
   x = 1,239.86