Finding the Fourth Proportional to 139,536.72, 209,305.22 and 50,790.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,536.72 : 209,305.22 = 50,790.96 : x
2. Step 2: Convert to fraction form
   139,536.72/209,305.22 = 50,790.96/x
3. Step 3: Cross multiply
   139,536.72x = 209,305.22 × 50,790.96
4. Step 4: Simplify right side
   139,536.72x = 10,630,812,802.86
5. Step 5: Solve for x
   x = 10,630,812,802.86/139,536.72
6. Step 6: Final answer
   x = 76,186.49