Finding the Fourth Proportional to 1,123.50, 1,683.63 and 636.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.50 : 1,683.63 = 636.42 : x
2. Step 2: Convert to fraction form
   1,123.50/1,683.63 = 636.42/x
3. Step 3: Cross multiply
   1,123.50x = 1,683.63 × 636.42
4. Step 4: Simplify right side
   1,123.50x = 1,071,495.80
5. Step 5: Solve for x
   x = 1,071,495.80/1,123.50
6. Step 6: Final answer
   x = 953.71