Finding the Fourth Proportional to 13,446.57, 18,556.62 and 7,478.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,446.57 : 18,556.62 = 7,478.63 : x
2. Step 2: Convert to fraction form
   13,446.57/18,556.62 = 7,478.63/x
3. Step 3: Cross multiply
   13,446.57x = 18,556.62 × 7,478.63
4. Step 4: Simplify right side
   13,446.57x = 138,778,002.25
5. Step 5: Solve for x
   x = 138,778,002.25/13,446.57
6. Step 6: Final answer
   x = 10,320.70