Finding the Fourth Proportional to 2,155.81, 3,230.43 and 985.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.81 : 3,230.43 = 985.12 : x
2. Step 2: Convert to fraction form
   2,155.81/3,230.43 = 985.12/x
3. Step 3: Cross multiply
   2,155.81x = 3,230.43 × 985.12
4. Step 4: Simplify right side
   2,155.81x = 3,182,361.20
5. Step 5: Solve for x
   x = 3,182,361.20/2,155.81
6. Step 6: Final answer
   x = 1,476.18