Finding the Fourth Proportional to 2,189.34, 3,282.12 and 891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.34 : 3,282.12 = 891.72 : x
2. Step 2: Convert to fraction form
   2,189.34/3,282.12 = 891.72/x
3. Step 3: Cross multiply
   2,189.34x = 3,282.12 × 891.72
4. Step 4: Simplify right side
   2,189.34x = 2,926,732.05
5. Step 5: Solve for x
   x = 2,926,732.05/2,189.34
6. Step 6: Final answer
   x = 1,336.81