Finding the Fourth Proportional to 91.59, 127.05 and 90.69

Step by Step Solution

1. Step 1: Write the proportion equation
   91.59 : 127.05 = 90.69 : x
2. Step 2: Convert to fraction form
   91.59/127.05 = 90.69/x
3. Step 3: Cross multiply
   91.59x = 127.05 × 90.69
4. Step 4: Simplify right side
   91.59x = 11,522.16
5. Step 5: Solve for x
   x = 11,522.16/91.59
6. Step 6: Final answer
   x = 125.80