Finding the Fourth Proportional to 3,613.30, 5,395.83 and 3,428.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.30 : 5,395.83 = 3,428.78 : x
2. Step 2: Convert to fraction form
   3,613.30/5,395.83 = 3,428.78/x
3. Step 3: Cross multiply
   3,613.30x = 5,395.83 × 3,428.78
4. Step 4: Simplify right side
   3,613.30x = 18,501,096.84
5. Step 5: Solve for x
   x = 18,501,096.84/3,613.30
6. Step 6: Final answer
   x = 5,120.28