Finding the Fourth Proportional to 12,128.98, 18,187.71 and 4,230.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.98 : 18,187.71 = 4,230.54 : x
2. Step 2: Convert to fraction form
   12,128.98/18,187.71 = 4,230.54/x
3. Step 3: Cross multiply
   12,128.98x = 18,187.71 × 4,230.54
4. Step 4: Simplify right side
   12,128.98x = 76,943,829.51
5. Step 5: Solve for x
   x = 76,943,829.51/12,128.98
6. Step 6: Final answer
   x = 6,343.80