Finding the Fourth Proportional to 1,609.40, 2,410.50 and 991.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.40 : 2,410.50 = 991.10 : x
2. Step 2: Convert to fraction form
   1,609.40/2,410.50 = 991.10/x
3. Step 3: Cross multiply
   1,609.40x = 2,410.50 × 991.10
4. Step 4: Simplify right side
   1,609.40x = 2,389,046.55
5. Step 5: Solve for x
   x = 2,389,046.55/1,609.40
6. Step 6: Final answer
   x = 1,484.43