Finding the Fourth Proportional to 1,561.44, 2,154.72 and 889.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.44 : 2,154.72 = 889.36 : x
2. Step 2: Convert to fraction form
   1,561.44/2,154.72 = 889.36/x
3. Step 3: Cross multiply
   1,561.44x = 2,154.72 × 889.36
4. Step 4: Simplify right side
   1,561.44x = 1,916,321.78
5. Step 5: Solve for x
   x = 1,916,321.78/1,561.44
6. Step 6: Final answer
   x = 1,227.28