Finding the Fourth Proportional to 1,423.69, 1,963.80 and 980.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.69 : 1,963.80 = 980.83 : x
2. Step 2: Convert to fraction form
   1,423.69/1,963.80 = 980.83/x
3. Step 3: Cross multiply
   1,423.69x = 1,963.80 × 980.83
4. Step 4: Simplify right side
   1,423.69x = 1,926,149.05
5. Step 5: Solve for x
   x = 1,926,149.05/1,423.69
6. Step 6: Final answer
   x = 1,352.93