Finding the Fourth Proportional to 1,411.39, 2,115.59 and 679.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.39 : 2,115.59 = 679.42 : x
2. Step 2: Convert to fraction form
   1,411.39/2,115.59 = 679.42/x
3. Step 3: Cross multiply
   1,411.39x = 2,115.59 × 679.42
4. Step 4: Simplify right side
   1,411.39x = 1,437,360.18
5. Step 5: Solve for x
   x = 1,437,360.18/1,411.39
6. Step 6: Final answer
   x = 1,018.40