Finding the Fourth Proportional to 2,645.04, 3,966.91 and 890.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.04 : 3,966.91 = 890.10 : x
2. Step 2: Convert to fraction form
   2,645.04/3,966.91 = 890.10/x
3. Step 3: Cross multiply
   2,645.04x = 3,966.91 × 890.10
4. Step 4: Simplify right side
   2,645.04x = 3,530,946.59
5. Step 5: Solve for x
   x = 3,530,946.59/2,645.04
6. Step 6: Final answer
   x = 1,334.93