Finding the Fourth Proportional to 7,128.55, 10,686.34 and 3,230.83

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.55 : 10,686.34 = 3,230.83 : x
2. Step 2: Convert to fraction form
   7,128.55/10,686.34 = 3,230.83/x
3. Step 3: Cross multiply
   7,128.55x = 10,686.34 × 3,230.83
4. Step 4: Simplify right side
   7,128.55x = 34,525,747.86
5. Step 5: Solve for x
   x = 34,525,747.86/7,128.55
6. Step 6: Final answer
   x = 4,843.31