Finding the Fourth Proportional to 3,820.47, 5,730.78 and 1,223.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.47 : 5,730.78 = 1,223.42 : x
2. Step 2: Convert to fraction form
   3,820.47/5,730.78 = 1,223.42/x
3. Step 3: Cross multiply
   3,820.47x = 5,730.78 × 1,223.42
4. Step 4: Simplify right side
   3,820.47x = 7,011,122.21
5. Step 5: Solve for x
   x = 7,011,122.21/3,820.47
6. Step 6: Final answer
   x = 1,835.15