Finding the Fourth Proportional to 1,383.87, 1,909.03 and 858.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.87 : 1,909.03 = 858.99 : x
2. Step 2: Convert to fraction form
   1,383.87/1,909.03 = 858.99/x
3. Step 3: Cross multiply
   1,383.87x = 1,909.03 × 858.99
4. Step 4: Simplify right side
   1,383.87x = 1,639,837.68
5. Step 5: Solve for x
   x = 1,639,837.68/1,383.87
6. Step 6: Final answer
   x = 1,184.97