Finding the Fourth Proportional to 331,131.89, 496,707.57 and 91,249.42

Step by Step Solution

1. Step 1: Write the proportion equation
   331,131.89 : 496,707.57 = 91,249.42 : x
2. Step 2: Convert to fraction form
   331,131.89/496,707.57 = 91,249.42/x
3. Step 3: Cross multiply
   331,131.89x = 496,707.57 × 91,249.42
4. Step 4: Simplify right side
   331,131.89x = 45,324,279,200.51
5. Step 5: Solve for x
   x = 45,324,279,200.51/331,131.89
6. Step 6: Final answer
   x = 136,876.82