Finding the Fourth Proportional to 1,213.61, 1,674.59 and 682.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213.61 : 1,674.59 = 682.43 : x
2. Step 2: Convert to fraction form
   1,213.61/1,674.59 = 682.43/x
3. Step 3: Cross multiply
   1,213.61x = 1,674.59 × 682.43
4. Step 4: Simplify right side
   1,213.61x = 1,142,787.04
5. Step 5: Solve for x
   x = 1,142,787.04/1,213.61
6. Step 6: Final answer
   x = 941.64