Finding the Fourth Proportional to 1,562.19, 2,155.83 and 863.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.19 : 2,155.83 = 863.57 : x
2. Step 2: Convert to fraction form
   1,562.19/2,155.83 = 863.57/x
3. Step 3: Cross multiply
   1,562.19x = 2,155.83 × 863.57
4. Step 4: Simplify right side
   1,562.19x = 1,861,695.02
5. Step 5: Solve for x
   x = 1,861,695.02/1,562.19
6. Step 6: Final answer
   x = 1,191.72