Finding the Fourth Proportional to 2,790.43, 4,185.86 and 842.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.43 : 4,185.86 = 842.63 : x
2. Step 2: Convert to fraction form
   2,790.43/4,185.86 = 842.63/x
3. Step 3: Cross multiply
   2,790.43x = 4,185.86 × 842.63
4. Step 4: Simplify right side
   2,790.43x = 3,527,106.07
5. Step 5: Solve for x
   x = 3,527,106.07/2,790.43
6. Step 6: Final answer
   x = 1,264.00