Finding the Fourth Proportional to 13,442.78, 18,550.71 and 7,474.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,442.78 : 18,550.71 = 7,474.43 : x
2. Step 2: Convert to fraction form
   13,442.78/18,550.71 = 7,474.43/x
3. Step 3: Cross multiply
   13,442.78x = 18,550.71 × 7,474.43
4. Step 4: Simplify right side
   13,442.78x = 138,655,890.59
5. Step 5: Solve for x
   x = 138,655,890.59/13,442.78
6. Step 6: Final answer
   x = 10,314.53