Finding the Fourth Proportional to 1,561.42, 2,154.54 and 898.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.42 : 2,154.54 = 898.03 : x
2. Step 2: Convert to fraction form
   1,561.42/2,154.54 = 898.03/x
3. Step 3: Cross multiply
   1,561.42x = 2,154.54 × 898.03
4. Step 4: Simplify right side
   1,561.42x = 1,934,841.56
5. Step 5: Solve for x
   x = 1,934,841.56/1,561.42
6. Step 6: Final answer
   x = 1,239.16