Finding the Fourth Proportional to 2,128.71, 3,190.29 and 894.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.71 : 3,190.29 = 894.42 : x
2. Step 2: Convert to fraction form
   2,128.71/3,190.29 = 894.42/x
3. Step 3: Cross multiply
   2,128.71x = 3,190.29 × 894.42
4. Step 4: Simplify right side
   2,128.71x = 2,853,459.18
5. Step 5: Solve for x
   x = 2,853,459.18/2,128.71
6. Step 6: Final answer
   x = 1,340.46