Finding the Fourth Proportional to 1,355.94, 2,031.78 and 989.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.94 : 2,031.78 = 989.04 : x
2. Step 2: Convert to fraction form
   1,355.94/2,031.78 = 989.04/x
3. Step 3: Cross multiply
   1,355.94x = 2,031.78 × 989.04
4. Step 4: Simplify right side
   1,355.94x = 2,009,511.69
5. Step 5: Solve for x
   x = 2,009,511.69/1,355.94
6. Step 6: Final answer
   x = 1,482.01