Finding the Fourth Proportional to 91,042.72, 136,324.82 and 73,178.57

Step by Step Solution

1. Step 1: Write the proportion equation
   91,042.72 : 136,324.82 = 73,178.57 : x
2. Step 2: Convert to fraction form
   91,042.72/136,324.82 = 73,178.57/x
3. Step 3: Cross multiply
   91,042.72x = 136,324.82 × 73,178.57
4. Step 4: Simplify right side
   91,042.72x = 9,976,055,906.87
5. Step 5: Solve for x
   x = 9,976,055,906.87/91,042.72
6. Step 6: Final answer
   x = 109,575.55