Finding the Fourth Proportional to 1,419.56, 2,118.90 and 1,318.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.56 : 2,118.90 = 1,318.12 : x
2. Step 2: Convert to fraction form
   1,419.56/2,118.90 = 1,318.12/x
3. Step 3: Cross multiply
   1,419.56x = 2,118.90 × 1,318.12
4. Step 4: Simplify right side
   1,419.56x = 2,792,964.47
5. Step 5: Solve for x
   x = 2,792,964.47/1,419.56
6. Step 6: Final answer
   x = 1,967.49