Finding the Fourth Proportional to 3,488.02, 5,231.88 and 890.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,488.02 : 5,231.88 = 890.90 : x
2. Step 2: Convert to fraction form
   3,488.02/5,231.88 = 890.90/x
3. Step 3: Cross multiply
   3,488.02x = 5,231.88 × 890.90
4. Step 4: Simplify right side
   3,488.02x = 4,661,081.89
5. Step 5: Solve for x
   x = 4,661,081.89/3,488.02
6. Step 6: Final answer
   x = 1,336.31