Finding the Fourth Proportional to 2,057.72, 2,853.39 and 1,988.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.72 : 2,853.39 = 1,988.45 : x
2. Step 2: Convert to fraction form
   2,057.72/2,853.39 = 1,988.45/x
3. Step 3: Cross multiply
   2,057.72x = 2,853.39 × 1,988.45
4. Step 4: Simplify right side
   2,057.72x = 5,673,823.35
5. Step 5: Solve for x
   x = 5,673,823.35/2,057.72
6. Step 6: Final answer
   x = 2,757.33