Finding the Fourth Proportional to 3,820.79, 5,731.08 and 1,223.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.79 : 5,731.08 = 1,223.69 : x
2. Step 2: Convert to fraction form
   3,820.79/5,731.08 = 1,223.69/x
3. Step 3: Cross multiply
   3,820.79x = 5,731.08 × 1,223.69
4. Step 4: Simplify right side
   3,820.79x = 7,013,065.29
5. Step 5: Solve for x
   x = 7,013,065.29/3,820.79
6. Step 6: Final answer
   x = 1,835.50