Finding the Fourth Proportional to 8,128.59, 12,188.34 and 3,060.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.59 : 12,188.34 = 3,060.72 : x
2. Step 2: Convert to fraction form
   8,128.59/12,188.34 = 3,060.72/x
3. Step 3: Cross multiply
   8,128.59x = 12,188.34 × 3,060.72
4. Step 4: Simplify right side
   8,128.59x = 37,305,096.00
5. Step 5: Solve for x
   x = 37,305,096.00/8,128.59
6. Step 6: Final answer
   x = 4,589.37