Finding the Fourth Proportional to 2,457.21, 3,390.89 and 1,338.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,457.21 : 3,390.89 = 1,338.15 : x
2. Step 2: Convert to fraction form
   2,457.21/3,390.89 = 1,338.15/x
3. Step 3: Cross multiply
   2,457.21x = 3,390.89 × 1,338.15
4. Step 4: Simplify right side
   2,457.21x = 4,537,519.45
5. Step 5: Solve for x
   x = 4,537,519.45/2,457.21
6. Step 6: Final answer
   x = 1,846.61