Finding the Fourth Proportional to 139,067.16, 208,609.54 and 53,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,067.16 : 208,609.54 = 53,718.72 : x
2. Step 2: Convert to fraction form
   139,067.16/208,609.54 = 53,718.72/x
3. Step 3: Cross multiply
   139,067.16x = 208,609.54 × 53,718.72
4. Step 4: Simplify right side
   139,067.16x = 11,206,237,468.59
5. Step 5: Solve for x
   x = 11,206,237,468.59/139,067.16
6. Step 6: Final answer
   x = 80,581.48