Finding the Fourth Proportional to 1,386.82, 2,076.63 and 769.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.82 : 2,076.63 = 769.24 : x
2. Step 2: Convert to fraction form
   1,386.82/2,076.63 = 769.24/x
3. Step 3: Cross multiply
   1,386.82x = 2,076.63 × 769.24
4. Step 4: Simplify right side
   1,386.82x = 1,597,426.86
5. Step 5: Solve for x
   x = 1,597,426.86/1,386.82
6. Step 6: Final answer
   x = 1,151.86