Finding the Fourth Proportional to 1,421.34, 1,961.46 and 890.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.34 : 1,961.46 = 890.52 : x
2. Step 2: Convert to fraction form
   1,421.34/1,961.46 = 890.52/x
3. Step 3: Cross multiply
   1,421.34x = 1,961.46 × 890.52
4. Step 4: Simplify right side
   1,421.34x = 1,746,719.36
5. Step 5: Solve for x
   x = 1,746,719.36/1,421.34
6. Step 6: Final answer
   x = 1,228.92