Finding the Fourth Proportional to 1,383.95, 1,909.74 and 786.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.95 : 1,909.74 = 786.46 : x
2. Step 2: Convert to fraction form
   1,383.95/1,909.74 = 786.46/x
3. Step 3: Cross multiply
   1,383.95x = 1,909.74 × 786.46
4. Step 4: Simplify right side
   1,383.95x = 1,501,935.88
5. Step 5: Solve for x
   x = 1,501,935.88/1,383.95
6. Step 6: Final answer
   x = 1,085.25