Finding the Fourth Proportional to 812.56, 1,123.05 and 681.34

Step by Step Solution

1. Step 1: Write the proportion equation
   812.56 : 1,123.05 = 681.34 : x
2. Step 2: Convert to fraction form
   812.56/1,123.05 = 681.34/x
3. Step 3: Cross multiply
   812.56x = 1,123.05 × 681.34
4. Step 4: Simplify right side
   812.56x = 765,178.89
5. Step 5: Solve for x
   x = 765,178.89/812.56
6. Step 6: Final answer
   x = 941.69