Finding the Fourth Proportional to 1,561.94, 2,155.48 and 863.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.94 : 2,155.48 = 863.32 : x
2. Step 2: Convert to fraction form
   1,561.94/2,155.48 = 863.32/x
3. Step 3: Cross multiply
   1,561.94x = 2,155.48 × 863.32
4. Step 4: Simplify right side
   1,561.94x = 1,860,853.90
5. Step 5: Solve for x
   x = 1,860,853.90/1,561.94
6. Step 6: Final answer
   x = 1,191.37