Finding the Fourth Proportional to 3,786.72, 5,681.52 and 1,321.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,786.72 : 5,681.52 = 1,321.80 : x
2. Step 2: Convert to fraction form
   3,786.72/5,681.52 = 1,321.80/x
3. Step 3: Cross multiply
   3,786.72x = 5,681.52 × 1,321.80
4. Step 4: Simplify right side
   3,786.72x = 7,509,833.14
5. Step 5: Solve for x
   x = 7,509,833.14/3,786.72
6. Step 6: Final answer
   x = 1,983.20