Finding the Fourth Proportional to 1,399.62, 2,099.84 and 1,142.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.62 : 2,099.84 = 1,142.06 : x
2. Step 2: Convert to fraction form
   1,399.62/2,099.84 = 1,142.06/x
3. Step 3: Cross multiply
   1,399.62x = 2,099.84 × 1,142.06
4. Step 4: Simplify right side
   1,399.62x = 2,398,127.06
5. Step 5: Solve for x
   x = 2,398,127.06/1,399.62
6. Step 6: Final answer
   x = 1,713.41