Finding the Fourth Proportional to 2,790.36, 4,185.41 and 842.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.36 : 4,185.41 = 842.50 : x
2. Step 2: Convert to fraction form
   2,790.36/4,185.41 = 842.50/x
3. Step 3: Cross multiply
   2,790.36x = 4,185.41 × 842.50
4. Step 4: Simplify right side
   2,790.36x = 3,526,210.03
5. Step 5: Solve for x
   x = 3,526,210.03/2,790.36
6. Step 6: Final answer
   x = 1,263.71