Finding the Fourth Proportional to 1,806.69, 2,493.23 and 978.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,806.69 : 2,493.23 = 978.69 : x
2. Step 2: Convert to fraction form
   1,806.69/2,493.23 = 978.69/x
3. Step 3: Cross multiply
   1,806.69x = 2,493.23 × 978.69
4. Step 4: Simplify right side
   1,806.69x = 2,440,099.27
5. Step 5: Solve for x
   x = 2,440,099.27/1,806.69
6. Step 6: Final answer
   x = 1,350.59