Finding the Fourth Proportional to 1,357.56, 1,870.68 and 1,042.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.56 : 1,870.68 = 1,042.80 : x
2. Step 2: Convert to fraction form
   1,357.56/1,870.68 = 1,042.80/x
3. Step 3: Cross multiply
   1,357.56x = 1,870.68 × 1,042.80
4. Step 4: Simplify right side
   1,357.56x = 1,950,745.10
5. Step 5: Solve for x
   x = 1,950,745.10/1,357.56
6. Step 6: Final answer
   x = 1,436.95