Finding the Fourth Proportional to 1,421.72, 1,962.94 and 890.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.72 : 1,962.94 = 890.82 : x
2. Step 2: Convert to fraction form
   1,421.72/1,962.94 = 890.82/x
3. Step 3: Cross multiply
   1,421.72x = 1,962.94 × 890.82
4. Step 4: Simplify right side
   1,421.72x = 1,748,626.21
5. Step 5: Solve for x
   x = 1,748,626.21/1,421.72
6. Step 6: Final answer
   x = 1,229.94