Finding the Fourth Proportional to 3,128.86, 4,309.02 and 3,060.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.86 : 4,309.02 = 3,060.82 : x
2. Step 2: Convert to fraction form
   3,128.86/4,309.02 = 3,060.82/x
3. Step 3: Cross multiply
   3,128.86x = 4,309.02 × 3,060.82
4. Step 4: Simplify right side
   3,128.86x = 13,189,134.60
5. Step 5: Solve for x
   x = 13,189,134.60/3,128.86
6. Step 6: Final answer
   x = 4,215.32