Finding the Fourth Proportional to 91.42, 137.16 and 28.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91.42 : 137.16 = 28.89 : x
2. Step 2: Convert to fraction form
   91.42/137.16 = 28.89/x
3. Step 3: Cross multiply
   91.42x = 137.16 × 28.89
4. Step 4: Simplify right side
   91.42x = 3,962.43
5. Step 5: Solve for x
   x = 3,962.43/91.42
6. Step 6: Final answer
   x = 43.34