Finding the Fourth Proportional to 1,378.96, 2,067.89 and 1,087.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.96 : 2,067.89 = 1,087.02 : x
2. Step 2: Convert to fraction form
   1,378.96/2,067.89 = 1,087.02/x
3. Step 3: Cross multiply
   1,378.96x = 2,067.89 × 1,087.02
4. Step 4: Simplify right side
   1,378.96x = 2,247,840.51
5. Step 5: Solve for x
   x = 2,247,840.51/1,378.96
6. Step 6: Final answer
   x = 1,630.10