Finding the Fourth Proportional to 139,694.72, 209,502.96 and 100,134.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,694.72 : 209,502.96 = 100,134.56 : x
2. Step 2: Convert to fraction form
   139,694.72/209,502.96 = 100,134.56/x
3. Step 3: Cross multiply
   139,694.72x = 209,502.96 × 100,134.56
4. Step 4: Simplify right side
   139,694.72x = 20,978,486,718.30
5. Step 5: Solve for x
   x = 20,978,486,718.30/139,694.72
6. Step 6: Final answer
   x = 150,173.80