Finding the Fourth Proportional to 1,560.48, 2,153.61 and 897.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.48 : 2,153.61 = 897.72 : x
2. Step 2: Convert to fraction form
   1,560.48/2,153.61 = 897.72/x
3. Step 3: Cross multiply
   1,560.48x = 2,153.61 × 897.72
4. Step 4: Simplify right side
   1,560.48x = 1,933,338.77
5. Step 5: Solve for x
   x = 1,933,338.77/1,560.48
6. Step 6: Final answer
   x = 1,238.94