Finding the Fourth Proportional to 1,562.31, 2,155.97 and 863.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.31 : 2,155.97 = 863.69 : x
2. Step 2: Convert to fraction form
   1,562.31/2,155.97 = 863.69/x
3. Step 3: Cross multiply
   1,562.31x = 2,155.97 × 863.69
4. Step 4: Simplify right side
   1,562.31x = 1,862,074.63
5. Step 5: Solve for x
   x = 1,862,074.63/1,562.31
6. Step 6: Final answer
   x = 1,191.87