Finding the Fourth Proportional to 2,633.94, 3,951.05 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,633.94 : 3,951.05 = 990.72 : x
2. Step 2: Convert to fraction form
   2,633.94/3,951.05 = 990.72/x
3. Step 3: Cross multiply
   2,633.94x = 3,951.05 × 990.72
4. Step 4: Simplify right side
   2,633.94x = 3,914,379.30
5. Step 5: Solve for x
   x = 3,914,379.30/2,633.94
6. Step 6: Final answer
   x = 1,486.13