Finding the Fourth Proportional to 1,788.72, 2,677.86 and 1,328.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.72 : 2,677.86 = 1,328.54 : x
2. Step 2: Convert to fraction form
   1,788.72/2,677.86 = 1,328.54/x
3. Step 3: Cross multiply
   1,788.72x = 2,677.86 × 1,328.54
4. Step 4: Simplify right side
   1,788.72x = 3,557,630.74
5. Step 5: Solve for x
   x = 3,557,630.74/1,788.72
6. Step 6: Final answer
   x = 1,988.93