Finding the Fourth Proportional to 12,128.85, 18,188.42 and 4,333.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.85 : 18,188.42 = 4,333.41 : x
2. Step 2: Convert to fraction form
   12,128.85/18,188.42 = 4,333.41/x
3. Step 3: Cross multiply
   12,128.85x = 18,188.42 × 4,333.41
4. Step 4: Simplify right side
   12,128.85x = 78,817,859.45
5. Step 5: Solve for x
   x = 78,817,859.45/12,128.85
6. Step 6: Final answer
   x = 6,498.38