Finding the Fourth Proportional to 13,446.86, 18,555.81 and 7,478.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,446.86 : 18,555.81 = 7,478.18 : x
2. Step 2: Convert to fraction form
   13,446.86/18,555.81 = 7,478.18/x
3. Step 3: Cross multiply
   13,446.86x = 18,555.81 × 7,478.18
4. Step 4: Simplify right side
   13,446.86x = 138,763,687.23
5. Step 5: Solve for x
   x = 138,763,687.23/13,446.86
6. Step 6: Final answer
   x = 10,319.41