Finding the Fourth Proportional to 1,861.59, 2,789.07 and 1,129.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.59 : 2,789.07 = 1,129.48 : x
2. Step 2: Convert to fraction form
   1,861.59/2,789.07 = 1,129.48/x
3. Step 3: Cross multiply
   1,861.59x = 2,789.07 × 1,129.48
4. Step 4: Simplify right side
   1,861.59x = 3,150,198.78
5. Step 5: Solve for x
   x = 3,150,198.78/1,861.59
6. Step 6: Final answer
   x = 1,692.21