Finding the Fourth Proportional to 2,789.48, 4,185.42 and 1,057.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,789.48 : 4,185.42 = 1,057.70 : x
2. Step 2: Convert to fraction form
   2,789.48/4,185.42 = 1,057.70/x
3. Step 3: Cross multiply
   2,789.48x = 4,185.42 × 1,057.70
4. Step 4: Simplify right side
   2,789.48x = 4,426,897.81
5. Step 5: Solve for x
   x = 4,426,897.81/2,789.48
6. Step 6: Final answer
   x = 1,587.00