Finding the Fourth Proportional to 3,820.89, 5,731.58 and 1,223.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.89 : 5,731.58 = 1,223.64 : x
2. Step 2: Convert to fraction form
   3,820.89/5,731.58 = 1,223.64/x
3. Step 3: Cross multiply
   3,820.89x = 5,731.58 × 1,223.64
4. Step 4: Simplify right side
   3,820.89x = 7,013,384.43
5. Step 5: Solve for x
   x = 7,013,384.43/3,820.89
6. Step 6: Final answer
   x = 1,835.54