Finding the Fourth Proportional to 1,788.78, 2,679.48 and 1,057.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.78 : 2,679.48 = 1,057.96 : x
2. Step 2: Convert to fraction form
   1,788.78/2,679.48 = 1,057.96/x
3. Step 3: Cross multiply
   1,788.78x = 2,679.48 × 1,057.96
4. Step 4: Simplify right side
   1,788.78x = 2,834,786.01
5. Step 5: Solve for x
   x = 2,834,786.01/1,788.78
6. Step 6: Final answer
   x = 1,584.76