Finding the Fourth Proportional to 1,561.58, 2,154.82 and 898.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.58 : 2,154.82 = 898.53 : x
2. Step 2: Convert to fraction form
   1,561.58/2,154.82 = 898.53/x
3. Step 3: Cross multiply
   1,561.58x = 2,154.82 × 898.53
4. Step 4: Simplify right side
   1,561.58x = 1,936,165.92
5. Step 5: Solve for x
   x = 1,936,165.92/1,561.58
6. Step 6: Final answer
   x = 1,239.88