Finding the Fourth Proportional to 1,560.67, 2,153.55 and 897.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.67 : 2,153.55 = 897.55 : x
2. Step 2: Convert to fraction form
   1,560.67/2,153.55 = 897.55/x
3. Step 3: Cross multiply
   1,560.67x = 2,153.55 × 897.55
4. Step 4: Simplify right side
   1,560.67x = 1,932,916.78
5. Step 5: Solve for x
   x = 1,932,916.78/1,560.67
6. Step 6: Final answer
   x = 1,238.52