Finding the Fourth Proportional to 1,561.49, 2,155.06 and 898.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.49 : 2,155.06 = 898.34 : x
2. Step 2: Convert to fraction form
   1,561.49/2,155.06 = 898.34/x
3. Step 3: Cross multiply
   1,561.49x = 2,155.06 × 898.34
4. Step 4: Simplify right side
   1,561.49x = 1,935,974.02
5. Step 5: Solve for x
   x = 1,935,974.02/1,561.49
6. Step 6: Final answer
   x = 1,239.82