Finding the Fourth Proportional to 33,139.48, 49,707.86 and 13,418.20

Step by Step Solution

1. Step 1: Write the proportion equation
   33,139.48 : 49,707.86 = 13,418.20 : x
2. Step 2: Convert to fraction form
   33,139.48/49,707.86 = 13,418.20/x
3. Step 3: Cross multiply
   33,139.48x = 49,707.86 × 13,418.20
4. Step 4: Simplify right side
   33,139.48x = 666,990,007.05
5. Step 5: Solve for x
   x = 666,990,007.05/33,139.48
6. Step 6: Final answer
   x = 20,126.75