Finding the Fourth Proportional to 1,861.52, 2,791.80 and 1,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.52 : 2,791.80 = 1,128.56 : x
2. Step 2: Convert to fraction form
   1,861.52/2,791.80 = 1,128.56/x
3. Step 3: Cross multiply
   1,861.52x = 2,791.80 × 1,128.56
4. Step 4: Simplify right side
   1,861.52x = 3,150,713.81
5. Step 5: Solve for x
   x = 3,150,713.81/1,861.52
6. Step 6: Final answer
   x = 1,692.55