Finding the Fourth Proportional to 1,363.40, 1,882.26 and 989.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,363.40 : 1,882.26 = 989.99 : x
2. Step 2: Convert to fraction form
   1,363.40/1,882.26 = 989.99/x
3. Step 3: Cross multiply
   1,363.40x = 1,882.26 × 989.99
4. Step 4: Simplify right side
   1,363.40x = 1,863,418.58
5. Step 5: Solve for x
   x = 1,863,418.58/1,363.40
6. Step 6: Final answer
   x = 1,366.74