Finding the Fourth Proportional to 91,314.72, 126,020.79 and 55,497.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91,314.72 : 126,020.79 = 55,497.78 : x
2. Step 2: Convert to fraction form
   91,314.72/126,020.79 = 55,497.78/x
3. Step 3: Cross multiply
   91,314.72x = 126,020.79 × 55,497.78
4. Step 4: Simplify right side
   91,314.72x = 6,993,874,078.85
5. Step 5: Solve for x
   x = 6,993,874,078.85/91,314.72
6. Step 6: Final answer
   x = 76,590.87