Finding the Fourth Proportional to 1,518.22, 2,276.72 and 641.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,518.22 : 2,276.72 = 641.12 : x
2. Step 2: Convert to fraction form
   1,518.22/2,276.72 = 641.12/x
3. Step 3: Cross multiply
   1,518.22x = 2,276.72 × 641.12
4. Step 4: Simplify right side
   1,518.22x = 1,459,647.52
5. Step 5: Solve for x
   x = 1,459,647.52/1,518.22
6. Step 6: Final answer
   x = 961.42