Finding the Fourth Proportional to 1,522.84, 2,103.04 and 999.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.84 : 2,103.04 = 999.20 : x
2. Step 2: Convert to fraction form
   1,522.84/2,103.04 = 999.20/x
3. Step 3: Cross multiply
   1,522.84x = 2,103.04 × 999.20
4. Step 4: Simplify right side
   1,522.84x = 2,101,357.57
5. Step 5: Solve for x
   x = 2,101,357.57/1,522.84
6. Step 6: Final answer
   x = 1,379.89