Finding the Fourth Proportional to 1,146.31, 1,581.89 and 622.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.31 : 1,581.89 = 622.34 : x
2. Step 2: Convert to fraction form
   1,146.31/1,581.89 = 622.34/x
3. Step 3: Cross multiply
   1,146.31x = 1,581.89 × 622.34
4. Step 4: Simplify right side
   1,146.31x = 984,473.42
5. Step 5: Solve for x
   x = 984,473.42/1,146.31
6. Step 6: Final answer
   x = 858.82