Finding the Fourth Proportional to 3,456.57, 5,184.27 and 990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.57 : 5,184.27 = 990.75 : x
2. Step 2: Convert to fraction form
   3,456.57/5,184.27 = 990.75/x
3. Step 3: Cross multiply
   3,456.57x = 5,184.27 × 990.75
4. Step 4: Simplify right side
   3,456.57x = 5,136,315.50
5. Step 5: Solve for x
   x = 5,136,315.50/3,456.57
6. Step 6: Final answer
   x = 1,485.96