Finding the Fourth Proportional to 1,561.82, 2,155.46 and 889.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.82 : 2,155.46 = 889.76 : x
2. Step 2: Convert to fraction form
   1,561.82/2,155.46 = 889.76/x
3. Step 3: Cross multiply
   1,561.82x = 2,155.46 × 889.76
4. Step 4: Simplify right side
   1,561.82x = 1,917,826.86
5. Step 5: Solve for x
   x = 1,917,826.86/1,561.82
6. Step 6: Final answer
   x = 1,227.95