Finding the Fourth Proportional to 2,634.53, 3,950.78 and 990.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,634.53 : 3,950.78 = 990.18 : x
2. Step 2: Convert to fraction form
   2,634.53/3,950.78 = 990.18/x
3. Step 3: Cross multiply
   2,634.53x = 3,950.78 × 990.18
4. Step 4: Simplify right side
   2,634.53x = 3,911,978.39
5. Step 5: Solve for x
   x = 3,911,978.39/2,634.53
6. Step 6: Final answer
   x = 1,484.89