Finding the Fourth Proportional to 1,146.23, 1,581.94 and 680.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.23 : 1,581.94 = 680.48 : x
2. Step 2: Convert to fraction form
   1,146.23/1,581.94 = 680.48/x
3. Step 3: Cross multiply
   1,146.23x = 1,581.94 × 680.48
4. Step 4: Simplify right side
   1,146.23x = 1,076,484.39
5. Step 5: Solve for x
   x = 1,076,484.39/1,146.23
6. Step 6: Final answer
   x = 939.15