Finding the Fourth Proportional to 2,790.28, 4,185.01 and 1,058.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.28 : 4,185.01 = 1,058.50 : x
2. Step 2: Convert to fraction form
   2,790.28/4,185.01 = 1,058.50/x
3. Step 3: Cross multiply
   2,790.28x = 4,185.01 × 1,058.50
4. Step 4: Simplify right side
   2,790.28x = 4,429,833.09
5. Step 5: Solve for x
   x = 4,429,833.09/2,790.28
6. Step 6: Final answer
   x = 1,587.59