Finding the Fourth Proportional to 1,399.02, 1,930.60 and 769.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.02 : 1,930.60 = 769.55 : x
2. Step 2: Convert to fraction form
   1,399.02/1,930.60 = 769.55/x
3. Step 3: Cross multiply
   1,399.02x = 1,930.60 × 769.55
4. Step 4: Simplify right side
   1,399.02x = 1,485,683.58
5. Step 5: Solve for x
   x = 1,485,683.58/1,399.02
6. Step 6: Final answer
   x = 1,061.95