Finding the Fourth Proportional to 91.23, 136.72 and 39.83

Step by Step Solution

1. Step 1: Write the proportion equation
   91.23 : 136.72 = 39.83 : x
2. Step 2: Convert to fraction form
   91.23/136.72 = 39.83/x
3. Step 3: Cross multiply
   91.23x = 136.72 × 39.83
4. Step 4: Simplify right side
   91.23x = 5,444.92
5. Step 5: Solve for x
   x = 5,444.92/91.23
6. Step 6: Final answer
   x = 59.69