Finding the Fourth Proportional to 91.69, 126.54 and 72.25

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 126.54 = 72.25 : x
2. Step 2: Convert to fraction form
   91.69/126.54 = 72.25/x
3. Step 3: Cross multiply
   91.69x = 126.54 × 72.25
4. Step 4: Simplify right side
   91.69x = 9,142.52
5. Step 5: Solve for x
   x = 9,142.52/91.69
6. Step 6: Final answer
   x = 99.71