Finding the Fourth Proportional to 2,189.31, 3,284.37 and 890.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.31 : 3,284.37 = 890.79 : x
2. Step 2: Convert to fraction form
   2,189.31/3,284.37 = 890.79/x
3. Step 3: Cross multiply
   2,189.31x = 3,284.37 × 890.79
4. Step 4: Simplify right side
   2,189.31x = 2,925,683.95
5. Step 5: Solve for x
   x = 2,925,683.95/2,189.31
6. Step 6: Final answer
   x = 1,336.35