Finding the Fourth Proportional to 2,633.88, 3,951.46 and 990.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,633.88 : 3,951.46 = 990.47 : x
2. Step 2: Convert to fraction form
   2,633.88/3,951.46 = 990.47/x
3. Step 3: Cross multiply
   2,633.88x = 3,951.46 × 990.47
4. Step 4: Simplify right side
   2,633.88x = 3,913,814.41
5. Step 5: Solve for x
   x = 3,913,814.41/2,633.88
6. Step 6: Final answer
   x = 1,485.95