Finding the Fourth Proportional to 3,455.34, 5,182.92 and 990.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,455.34 : 5,182.92 = 990.10 : x
2. Step 2: Convert to fraction form
   3,455.34/5,182.92 = 990.10/x
3. Step 3: Cross multiply
   3,455.34x = 5,182.92 × 990.10
4. Step 4: Simplify right side
   3,455.34x = 5,131,609.09
5. Step 5: Solve for x
   x = 5,131,609.09/3,455.34
6. Step 6: Final answer
   x = 1,485.12