Finding the Fourth Proportional to 1,859.16, 2,788.63 and 1,128.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.16 : 2,788.63 = 1,128.54 : x
2. Step 2: Convert to fraction form
   1,859.16/2,788.63 = 1,128.54/x
3. Step 3: Cross multiply
   1,859.16x = 2,788.63 × 1,128.54
4. Step 4: Simplify right side
   1,859.16x = 3,147,080.50
5. Step 5: Solve for x
   x = 3,147,080.50/1,859.16
6. Step 6: Final answer
   x = 1,692.74