Finding the Fourth Proportional to 1,421.31, 1,960.86 and 889.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.31 : 1,960.86 = 889.97 : x
2. Step 2: Convert to fraction form
   1,421.31/1,960.86 = 889.97/x
3. Step 3: Cross multiply
   1,421.31x = 1,960.86 × 889.97
4. Step 4: Simplify right side
   1,421.31x = 1,745,106.57
5. Step 5: Solve for x
   x = 1,745,106.57/1,421.31
6. Step 6: Final answer
   x = 1,227.82