Finding the Fourth Proportional to 13,446.50, 18,556.67 and 7,478.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,446.50 : 18,556.67 = 7,478.59 : x
2. Step 2: Convert to fraction form
   13,446.50/18,556.67 = 7,478.59/x
3. Step 3: Cross multiply
   13,446.50x = 18,556.67 × 7,478.59
4. Step 4: Simplify right side
   13,446.50x = 138,777,768.59
5. Step 5: Solve for x
   x = 138,777,768.59/13,446.50
6. Step 6: Final answer
   x = 10,320.74