Finding the Fourth Proportional to 1,408.31, 1,942.28 and 1,055.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.31 : 1,942.28 = 1,055.06 : x
2. Step 2: Convert to fraction form
   1,408.31/1,942.28 = 1,055.06/x
3. Step 3: Cross multiply
   1,408.31x = 1,942.28 × 1,055.06
4. Step 4: Simplify right side
   1,408.31x = 2,049,212.23
5. Step 5: Solve for x
   x = 2,049,212.23/1,408.31
6. Step 6: Final answer
   x = 1,455.09