Finding the Fourth Proportional to 2,634.42, 3,951.69 and 990.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,634.42 : 3,951.69 = 990.63 : x
2. Step 2: Convert to fraction form
   2,634.42/3,951.69 = 990.63/x
3. Step 3: Cross multiply
   2,634.42x = 3,951.69 × 990.63
4. Step 4: Simplify right side
   2,634.42x = 3,914,658.95
5. Step 5: Solve for x
   x = 3,914,658.95/2,634.42
6. Step 6: Final answer
   x = 1,485.96