Finding the Fourth Proportional to 1,383.93, 1,909.98 and 786.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.93 : 1,909.98 = 786.56 : x
2. Step 2: Convert to fraction form
   1,383.93/1,909.98 = 786.56/x
3. Step 3: Cross multiply
   1,383.93x = 1,909.98 × 786.56
4. Step 4: Simplify right side
   1,383.93x = 1,502,304.32
5. Step 5: Solve for x
   x = 1,502,304.32/1,383.93
6. Step 6: Final answer
   x = 1,085.53