Finding the Fourth Proportional to 12,438.82, 18,658.91 and 5,042.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,438.82 : 18,658.91 = 5,042.18 : x
2. Step 2: Convert to fraction form
   12,438.82/18,658.91 = 5,042.18/x
3. Step 3: Cross multiply
   12,438.82x = 18,658.91 × 5,042.18
4. Step 4: Simplify right side
   12,438.82x = 94,081,582.82
5. Step 5: Solve for x
   x = 94,081,582.82/12,438.82
6. Step 6: Final answer
   x = 7,563.55