Finding the Fourth Proportional to 1,409.96, 1,943.69 and 989.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.96 : 1,943.69 = 989.05 : x
2. Step 2: Convert to fraction form
   1,409.96/1,943.69 = 989.05/x
3. Step 3: Cross multiply
   1,409.96x = 1,943.69 × 989.05
4. Step 4: Simplify right side
   1,409.96x = 1,922,406.59
5. Step 5: Solve for x
   x = 1,922,406.59/1,409.96
6. Step 6: Final answer
   x = 1,363.45