Finding the Fourth Proportional to 2,620.68, 3,930.98 and 890.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.68 : 3,930.98 = 890.52 : x
2. Step 2: Convert to fraction form
   2,620.68/3,930.98 = 890.52/x
3. Step 3: Cross multiply
   2,620.68x = 3,930.98 × 890.52
4. Step 4: Simplify right side
   2,620.68x = 3,500,616.31
5. Step 5: Solve for x
   x = 3,500,616.31/2,620.68
6. Step 6: Final answer
   x = 1,335.77