Finding the Fourth Proportional to 3,840.45, 5,758.79 and 1,243.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,840.45 : 5,758.79 = 1,243.05 : x
2. Step 2: Convert to fraction form
   3,840.45/5,758.79 = 1,243.05/x
3. Step 3: Cross multiply
   3,840.45x = 5,758.79 × 1,243.05
4. Step 4: Simplify right side
   3,840.45x = 7,158,457.69
5. Step 5: Solve for x
   x = 7,158,457.69/3,840.45
6. Step 6: Final answer
   x = 1,863.96