Finding the Fourth Proportional to 2,632.41, 3,948.57 and 990.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,632.41 : 3,948.57 = 990.09 : x
2. Step 2: Convert to fraction form
   2,632.41/3,948.57 = 990.09/x
3. Step 3: Cross multiply
   2,632.41x = 3,948.57 × 990.09
4. Step 4: Simplify right side
   2,632.41x = 3,909,439.67
5. Step 5: Solve for x
   x = 3,909,439.67/2,632.41
6. Step 6: Final answer
   x = 1,485.12