Finding the Fourth Proportional to 12,291.09, 18,438.46 and 4,499.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,291.09 : 18,438.46 = 4,499.30 : x
2. Step 2: Convert to fraction form
   12,291.09/18,438.46 = 4,499.30/x
3. Step 3: Cross multiply
   12,291.09x = 18,438.46 × 4,499.30
4. Step 4: Simplify right side
   12,291.09x = 82,960,106.86
5. Step 5: Solve for x
   x = 82,960,106.86/12,291.09
6. Step 6: Final answer
   x = 6,749.61