Finding the Fourth Proportional to 1,561.23, 2,154.72 and 898.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.23 : 2,154.72 = 898.24 : x
2. Step 2: Convert to fraction form
   1,561.23/2,154.72 = 898.24/x
3. Step 3: Cross multiply
   1,561.23x = 2,154.72 × 898.24
4. Step 4: Simplify right side
   1,561.23x = 1,935,455.69
5. Step 5: Solve for x
   x = 1,935,455.69/1,561.23
6. Step 6: Final answer
   x = 1,239.70