Finding the Fourth Proportional to 1,146.09, 1,581.60 and 622.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.09 : 1,581.60 = 622.12 : x
2. Step 2: Convert to fraction form
   1,146.09/1,581.60 = 622.12/x
3. Step 3: Cross multiply
   1,146.09x = 1,581.60 × 622.12
4. Step 4: Simplify right side
   1,146.09x = 983,941.04
5. Step 5: Solve for x
   x = 983,941.04/1,146.09
6. Step 6: Final answer
   x = 858.52