Finding the Fourth Proportional to 3,658.95, 5,487.73 and 990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,658.95 : 5,487.73 = 990.50 : x
2. Step 2: Convert to fraction form
   3,658.95/5,487.73 = 990.50/x
3. Step 3: Cross multiply
   3,658.95x = 5,487.73 × 990.50
4. Step 4: Simplify right side
   3,658.95x = 5,435,566.65
5. Step 5: Solve for x
   x = 5,435,566.65/3,658.95
6. Step 6: Final answer
   x = 1,485.55