Finding the Fourth Proportional to 3,820.70, 5,729.16 and 1,223.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.70 : 5,729.16 = 1,223.30 : x
2. Step 2: Convert to fraction form
   3,820.70/5,729.16 = 1,223.30/x
3. Step 3: Cross multiply
   3,820.70x = 5,729.16 × 1,223.30
4. Step 4: Simplify right side
   3,820.70x = 7,008,481.43
5. Step 5: Solve for x
   x = 7,008,481.43/3,820.70
6. Step 6: Final answer
   x = 1,834.34