Finding the Fourth Proportional to 5,123.30, 7,683.60 and 1,613.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.30 : 7,683.60 = 1,613.30 : x
2. Step 2: Convert to fraction form
   5,123.30/7,683.60 = 1,613.30/x
3. Step 3: Cross multiply
   5,123.30x = 7,683.60 × 1,613.30
4. Step 4: Simplify right side
   5,123.30x = 12,395,951.88
5. Step 5: Solve for x
   x = 12,395,951.88/5,123.30
6. Step 6: Final answer
   x = 2,419.52