Finding the Fourth Proportional to 1,213.61, 1,674.72 and 682.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213.61 : 1,674.72 = 682.56 : x
2. Step 2: Convert to fraction form
   1,213.61/1,674.72 = 682.56/x
3. Step 3: Cross multiply
   1,213.61x = 1,674.72 × 682.56
4. Step 4: Simplify right side
   1,213.61x = 1,143,096.88
5. Step 5: Solve for x
   x = 1,143,096.88/1,213.61
6. Step 6: Final answer
   x = 941.90