Finding the Fourth Proportional to 12,187.82, 18,281.89 and 4,290.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,187.82 : 18,281.89 = 4,290.58 : x
2. Step 2: Convert to fraction form
   12,187.82/18,281.89 = 4,290.58/x
3. Step 3: Cross multiply
   12,187.82x = 18,281.89 × 4,290.58
4. Step 4: Simplify right side
   12,187.82x = 78,439,911.60
5. Step 5: Solve for x
   x = 78,439,911.60/12,187.82
6. Step 6: Final answer
   x = 6,435.93