Finding the Fourth Proportional to 91.29, 136.79 and 42.51

Step by Step Solution

1. Step 1: Write the proportion equation
   91.29 : 136.79 = 42.51 : x
2. Step 2: Convert to fraction form
   91.29/136.79 = 42.51/x
3. Step 3: Cross multiply
   91.29x = 136.79 × 42.51
4. Step 4: Simplify right side
   91.29x = 5,814.26
5. Step 5: Solve for x
   x = 5,814.26/91.29
6. Step 6: Final answer
   x = 63.69