Finding the Fourth Proportional to 1,383.13, 1,908.61 and 851.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.13 : 1,908.61 = 851.86 : x
2. Step 2: Convert to fraction form
   1,383.13/1,908.61 = 851.86/x
3. Step 3: Cross multiply
   1,383.13x = 1,908.61 × 851.86
4. Step 4: Simplify right side
   1,383.13x = 1,625,861.61
5. Step 5: Solve for x
   x = 1,625,861.61/1,383.13
6. Step 6: Final answer
   x = 1,175.50