Finding the Fourth Proportional to 2,632.76, 3,951.18 and 990.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,632.76 : 3,951.18 = 990.80 : x
2. Step 2: Convert to fraction form
   2,632.76/3,951.18 = 990.80/x
3. Step 3: Cross multiply
   2,632.76x = 3,951.18 × 990.80
4. Step 4: Simplify right side
   2,632.76x = 3,914,829.14
5. Step 5: Solve for x
   x = 3,914,829.14/2,632.76
6. Step 6: Final answer
   x = 1,486.97