Finding the Fourth Proportional to 1,085.00, 1,490.99 and 863.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.00 : 1,490.99 = 863.56 : x
2. Step 2: Convert to fraction form
   1,085.00/1,490.99 = 863.56/x
3. Step 3: Cross multiply
   1,085.00x = 1,490.99 × 863.56
4. Step 4: Simplify right side
   1,085.00x = 1,287,565.37
5. Step 5: Solve for x
   x = 1,287,565.37/1,085.00
6. Step 6: Final answer
   x = 1,186.70