Finding the Fourth Proportional to 1,521.18, 2,099.23 and 961.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.18 : 2,099.23 = 961.89 : x
2. Step 2: Convert to fraction form
   1,521.18/2,099.23 = 961.89/x
3. Step 3: Cross multiply
   1,521.18x = 2,099.23 × 961.89
4. Step 4: Simplify right side
   1,521.18x = 2,019,228.34
5. Step 5: Solve for x
   x = 2,019,228.34/1,521.18
6. Step 6: Final answer
   x = 1,327.41