Finding the Fourth Proportional to 1,123.18, 1,684.98 and 353.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.18 : 1,684.98 = 353.50 : x
2. Step 2: Convert to fraction form
   1,123.18/1,684.98 = 353.50/x
3. Step 3: Cross multiply
   1,123.18x = 1,684.98 × 353.50
4. Step 4: Simplify right side
   1,123.18x = 595,640.43
5. Step 5: Solve for x
   x = 595,640.43/1,123.18
6. Step 6: Final answer
   x = 530.32