Finding the Fourth Proportional to 2,100.21, 3,150.12 and 989.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.21 : 3,150.12 = 989.37 : x
2. Step 2: Convert to fraction form
   2,100.21/3,150.12 = 989.37/x
3. Step 3: Cross multiply
   2,100.21x = 3,150.12 × 989.37
4. Step 4: Simplify right side
   2,100.21x = 3,116,634.22
5. Step 5: Solve for x
   x = 3,116,634.22/2,100.21
6. Step 6: Final answer
   x = 1,483.96