Finding the Fourth Proportional to 2,428.80, 3,645.12 and 890.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,428.80 : 3,645.12 = 890.24 : x
2. Step 2: Convert to fraction form
   2,428.80/3,645.12 = 890.24/x
3. Step 3: Cross multiply
   2,428.80x = 3,645.12 × 890.24
4. Step 4: Simplify right side
   2,428.80x = 3,245,031.63
5. Step 5: Solve for x
   x = 3,245,031.63/2,428.80
6. Step 6: Final answer
   x = 1,336.06