Finding the Fourth Proportional to 2,631.82, 3,945.29 and 989.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.82 : 3,945.29 = 989.45 : x
2. Step 2: Convert to fraction form
   2,631.82/3,945.29 = 989.45/x
3. Step 3: Cross multiply
   2,631.82x = 3,945.29 × 989.45
4. Step 4: Simplify right side
   2,631.82x = 3,903,672.11
5. Step 5: Solve for x
   x = 3,903,672.11/2,631.82
6. Step 6: Final answer
   x = 1,483.26