Finding the Fourth Proportional to 1,561.78, 2,151.98 and 1,063.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.78 : 2,151.98 = 1,063.54 : x
2. Step 2: Convert to fraction form
   1,561.78/2,151.98 = 1,063.54/x
3. Step 3: Cross multiply
   1,561.78x = 2,151.98 × 1,063.54
4. Step 4: Simplify right side
   1,561.78x = 2,288,711.49
5. Step 5: Solve for x
   x = 2,288,711.49/1,561.78
6. Step 6: Final answer
   x = 1,465.45