Finding the Fourth Proportional to 1,561.16, 2,153.92 and 897.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.16 : 2,153.92 = 897.88 : x
2. Step 2: Convert to fraction form
   1,561.16/2,153.92 = 897.88/x
3. Step 3: Cross multiply
   1,561.16x = 2,153.92 × 897.88
4. Step 4: Simplify right side
   1,561.16x = 1,933,961.69
5. Step 5: Solve for x
   x = 1,933,961.69/1,561.16
6. Step 6: Final answer
   x = 1,238.80