Finding the Fourth Proportional to 3,081.61, 4,622.31 and 890.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,081.61 : 4,622.31 = 890.56 : x
2. Step 2: Convert to fraction form
   3,081.61/4,622.31 = 890.56/x
3. Step 3: Cross multiply
   3,081.61x = 4,622.31 × 890.56
4. Step 4: Simplify right side
   3,081.61x = 4,116,444.39
5. Step 5: Solve for x
   x = 4,116,444.39/3,081.61
6. Step 6: Final answer
   x = 1,335.81