Finding the Fourth Proportional to 1,383.58, 1,909.59 and 786.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.58 : 1,909.59 = 786.07 : x
2. Step 2: Convert to fraction form
   1,383.58/1,909.59 = 786.07/x
3. Step 3: Cross multiply
   1,383.58x = 1,909.59 × 786.07
4. Step 4: Simplify right side
   1,383.58x = 1,501,061.86
5. Step 5: Solve for x
   x = 1,501,061.86/1,383.58
6. Step 6: Final answer
   x = 1,084.92