Finding the Fourth Proportional to 13,262.42, 18,308.40 and 8,419.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,262.42 : 18,308.40 = 8,419.58 : x
2. Step 2: Convert to fraction form
   13,262.42/18,308.40 = 8,419.58/x
3. Step 3: Cross multiply
   13,262.42x = 18,308.40 × 8,419.58
4. Step 4: Simplify right side
   13,262.42x = 154,149,038.47
5. Step 5: Solve for x
   x = 154,149,038.47/13,262.42
6. Step 6: Final answer
   x = 11,622.99