Finding the Fourth Proportional to 1,521.69, 2,099.11 and 1,078.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.69 : 2,099.11 = 1,078.81 : x
2. Step 2: Convert to fraction form
   1,521.69/2,099.11 = 1,078.81/x
3. Step 3: Cross multiply
   1,521.69x = 2,099.11 × 1,078.81
4. Step 4: Simplify right side
   1,521.69x = 2,264,540.86
5. Step 5: Solve for x
   x = 2,264,540.86/1,521.69
6. Step 6: Final answer
   x = 1,488.17