Finding the Fourth Proportional to 2,645.15, 3,968.33 and 890.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.15 : 3,968.33 = 890.37 : x
2. Step 2: Convert to fraction form
   2,645.15/3,968.33 = 890.37/x
3. Step 3: Cross multiply
   2,645.15x = 3,968.33 × 890.37
4. Step 4: Simplify right side
   2,645.15x = 3,533,277.53
5. Step 5: Solve for x
   x = 3,533,277.53/2,645.15
6. Step 6: Final answer
   x = 1,335.76