Finding the Fourth Proportional to 91.10, 137.48 and 91.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91.10 : 137.48 = 91.10 : x
2. Step 2: Convert to fraction form
   91.10/137.48 = 91.10/x
3. Step 3: Cross multiply
   91.10x = 137.48 × 91.10
4. Step 4: Simplify right side
   91.10x = 12,524.43
5. Step 5: Solve for x
   x = 12,524.43/91.10
6. Step 6: Final answer
   x = 137.48