Finding the Fourth Proportional to 1,383.06, 1,908.73 and 859.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.06 : 1,908.73 = 859.20 : x
2. Step 2: Convert to fraction form
   1,383.06/1,908.73 = 859.20/x
3. Step 3: Cross multiply
   1,383.06x = 1,908.73 × 859.20
4. Step 4: Simplify right side
   1,383.06x = 1,639,980.82
5. Step 5: Solve for x
   x = 1,639,980.82/1,383.06
6. Step 6: Final answer
   x = 1,185.76