Finding the Fourth Proportional to 91.83, 127.29 and 90.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91.83 : 127.29 = 90.30 : x
2. Step 2: Convert to fraction form
   91.83/127.29 = 90.30/x
3. Step 3: Cross multiply
   91.83x = 127.29 × 90.30
4. Step 4: Simplify right side
   91.83x = 11,494.29
5. Step 5: Solve for x
   x = 11,494.29/91.83
6. Step 6: Final answer
   x = 125.17