Finding the Fourth Proportional to 1,562.34, 2,155.86 and 863.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.34 : 2,155.86 = 863.58 : x
2. Step 2: Convert to fraction form
   1,562.34/2,155.86 = 863.58/x
3. Step 3: Cross multiply
   1,562.34x = 2,155.86 × 863.58
4. Step 4: Simplify right side
   1,562.34x = 1,861,757.58
5. Step 5: Solve for x
   x = 1,861,757.58/1,562.34
6. Step 6: Final answer
   x = 1,191.65