Finding the Fourth Proportional to 1,158.99, 1,599.69 and 786.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.99 : 1,599.69 = 786.59 : x
2. Step 2: Convert to fraction form
   1,158.99/1,599.69 = 786.59/x
3. Step 3: Cross multiply
   1,158.99x = 1,599.69 × 786.59
4. Step 4: Simplify right side
   1,158.99x = 1,258,300.16
5. Step 5: Solve for x
   x = 1,258,300.16/1,158.99
6. Step 6: Final answer
   x = 1,085.69