Finding the Fourth Proportional to 1,401.33, 2,099.67 and 989.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.33 : 2,099.67 = 989.63 : x
2. Step 2: Convert to fraction form
   1,401.33/2,099.67 = 989.63/x
3. Step 3: Cross multiply
   1,401.33x = 2,099.67 × 989.63
4. Step 4: Simplify right side
   1,401.33x = 2,077,885.92
5. Step 5: Solve for x
   x = 2,077,885.92/1,401.33
6. Step 6: Final answer
   x = 1,482.80