Finding the Fourth Proportional to 1,928.52, 2,661 and 1,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.52 : 2,661 = 1,131.72 : x
2. Step 2: Convert to fraction form
   1,928.52/2,661 = 1,131.72/x
3. Step 3: Cross multiply
   1,928.52x = 2,661 × 1,131.72
4. Step 4: Simplify right side
   1,928.52x = 3,011,506.92
5. Step 5: Solve for x
   x = 3,011,506.92/1,928.52
6. Step 6: Final answer
   x = 1,561.56