Finding the Fourth Proportional to 2,387.21, 3,575.48 and 1,155.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.21 : 3,575.48 = 1,155.47 : x
2. Step 2: Convert to fraction form
   2,387.21/3,575.48 = 1,155.47/x
3. Step 3: Cross multiply
   2,387.21x = 3,575.48 × 1,155.47
4. Step 4: Simplify right side
   2,387.21x = 4,131,336.22
5. Step 5: Solve for x
   x = 4,131,336.22/2,387.21
6. Step 6: Final answer
   x = 1,730.62