Finding the Fourth Proportional to 91.25, 136.89 and 43.13

Step by Step Solution

1. Step 1: Write the proportion equation
   91.25 : 136.89 = 43.13 : x
2. Step 2: Convert to fraction form
   91.25/136.89 = 43.13/x
3. Step 3: Cross multiply
   91.25x = 136.89 × 43.13
4. Step 4: Simplify right side
   91.25x = 5,903.27
5. Step 5: Solve for x
   x = 5,903.27/91.25
6. Step 6: Final answer
   x = 64.70