Finding the Fourth Proportional to 1,561.52, 2,155.15 and 898.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.52 : 2,155.15 = 898.24 : x
2. Step 2: Convert to fraction form
   1,561.52/2,155.15 = 898.24/x
3. Step 3: Cross multiply
   1,561.52x = 2,155.15 × 898.24
4. Step 4: Simplify right side
   1,561.52x = 1,935,841.94
5. Step 5: Solve for x
   x = 1,935,841.94/1,561.52
6. Step 6: Final answer
   x = 1,239.72