Finding the Fourth Proportional to 139,134.21, 208,516.78 and 72,630.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139,134.21 : 208,516.78 = 72,630.27 : x
2. Step 2: Convert to fraction form
   139,134.21/208,516.78 = 72,630.27/x
3. Step 3: Cross multiply
   139,134.21x = 208,516.78 × 72,630.27
4. Step 4: Simplify right side
   139,134.21x = 15,144,630,121.72
5. Step 5: Solve for x
   x = 15,144,630,121.72/139,134.21
6. Step 6: Final answer
   x = 108,849.08