Finding the Fourth Proportional to 1,146.22, 1,581.81 and 680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.22 : 1,581.81 = 680.50 : x
2. Step 2: Convert to fraction form
   1,146.22/1,581.81 = 680.50/x
3. Step 3: Cross multiply
   1,146.22x = 1,581.81 × 680.50
4. Step 4: Simplify right side
   1,146.22x = 1,076,421.71
5. Step 5: Solve for x
   x = 1,076,421.71/1,146.22
6. Step 6: Final answer
   x = 939.11