Finding the Fourth Proportional to 1,355.46, 1,871.31 and 890.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.46 : 1,871.31 = 890.52 : x
2. Step 2: Convert to fraction form
   1,355.46/1,871.31 = 890.52/x
3. Step 3: Cross multiply
   1,355.46x = 1,871.31 × 890.52
4. Step 4: Simplify right side
   1,355.46x = 1,666,438.98
5. Step 5: Solve for x
   x = 1,666,438.98/1,355.46
6. Step 6: Final answer
   x = 1,229.43