Finding the Fourth Proportional to 1,622.57, 2,431.83 and 890.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,622.57 : 2,431.83 = 890.87 : x
2. Step 2: Convert to fraction form
   1,622.57/2,431.83 = 890.87/x
3. Step 3: Cross multiply
   1,622.57x = 2,431.83 × 890.87
4. Step 4: Simplify right side
   1,622.57x = 2,166,444.39
5. Step 5: Solve for x
   x = 2,166,444.39/1,622.57
6. Step 6: Final answer
   x = 1,335.19