Finding the Fourth Proportional to 1,788.69, 2,680.29 and 1,057.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.69 : 2,680.29 = 1,057.50 : x
2. Step 2: Convert to fraction form
   1,788.69/2,680.29 = 1,057.50/x
3. Step 3: Cross multiply
   1,788.69x = 2,680.29 × 1,057.50
4. Step 4: Simplify right side
   1,788.69x = 2,834,406.68
5. Step 5: Solve for x
   x = 2,834,406.68/1,788.69
6. Step 6: Final answer
   x = 1,584.63