Finding the Fourth Proportional to 1,060.31, 1,585.59 and 863.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.31 : 1,585.59 = 863.48 : x
2. Step 2: Convert to fraction form
   1,060.31/1,585.59 = 863.48/x
3. Step 3: Cross multiply
   1,060.31x = 1,585.59 × 863.48
4. Step 4: Simplify right side
   1,060.31x = 1,369,117.33
5. Step 5: Solve for x
   x = 1,369,117.33/1,060.31
6. Step 6: Final answer
   x = 1,291.25