Finding the Fourth Proportional to 1,123.05, 1,684.58 and 613.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.05 : 1,684.58 = 613.29 : x
2. Step 2: Convert to fraction form
   1,123.05/1,684.58 = 613.29/x
3. Step 3: Cross multiply
   1,123.05x = 1,684.58 × 613.29
4. Step 4: Simplify right side
   1,123.05x = 1,033,136.07
5. Step 5: Solve for x
   x = 1,033,136.07/1,123.05
6. Step 6: Final answer
   x = 919.94