Finding the Fourth Proportional to 1,123.57, 1,684.81 and 636.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.57 : 1,684.81 = 636.49 : x
2. Step 2: Convert to fraction form
   1,123.57/1,684.81 = 636.49/x
3. Step 3: Cross multiply
   1,123.57x = 1,684.81 × 636.49
4. Step 4: Simplify right side
   1,123.57x = 1,072,364.72
5. Step 5: Solve for x
   x = 1,072,364.72/1,123.57
6. Step 6: Final answer
   x = 954.43