Finding the Fourth Proportional to 1,561.65, 2,154.72 and 898.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.65 : 2,154.72 = 898.38 : x
2. Step 2: Convert to fraction form
   1,561.65/2,154.72 = 898.38/x
3. Step 3: Cross multiply
   1,561.65x = 2,154.72 × 898.38
4. Step 4: Simplify right side
   1,561.65x = 1,935,757.35
5. Step 5: Solve for x
   x = 1,935,757.35/1,561.65
6. Step 6: Final answer
   x = 1,239.56