Finding the Fourth Proportional to 91.72, 137.59 and 50.58

Step by Step Solution

1. Step 1: Write the proportion equation
   91.72 : 137.59 = 50.58 : x
2. Step 2: Convert to fraction form
   91.72/137.59 = 50.58/x
3. Step 3: Cross multiply
   91.72x = 137.59 × 50.58
4. Step 4: Simplify right side
   91.72x = 6,959.30
5. Step 5: Solve for x
   x = 6,959.30/91.72
6. Step 6: Final answer
   x = 75.88