Finding the Fourth Proportional to 91.02, 136.43 and 42.21

Step by Step Solution

1. Step 1: Write the proportion equation
   91.02 : 136.43 = 42.21 : x
2. Step 2: Convert to fraction form
   91.02/136.43 = 42.21/x
3. Step 3: Cross multiply
   91.02x = 136.43 × 42.21
4. Step 4: Simplify right side
   91.02x = 5,758.16
5. Step 5: Solve for x
   x = 5,758.16/91.02
6. Step 6: Final answer
   x = 63.26