Finding the Fourth Proportional to 91.83, 126.72 and 56.82

Step by Step Solution

1. Step 1: Write the proportion equation
   91.83 : 126.72 = 56.82 : x
2. Step 2: Convert to fraction form
   91.83/126.72 = 56.82/x
3. Step 3: Cross multiply
   91.83x = 126.72 × 56.82
4. Step 4: Simplify right side
   91.83x = 7,200.23
5. Step 5: Solve for x
   x = 7,200.23/91.83
6. Step 6: Final answer
   x = 78.41