Finding the Fourth Proportional to 91.89, 126.43 and 71.06

Step by Step Solution

1. Step 1: Write the proportion equation
   91.89 : 126.43 = 71.06 : x
2. Step 2: Convert to fraction form
   91.89/126.43 = 71.06/x
3. Step 3: Cross multiply
   91.89x = 126.43 × 71.06
4. Step 4: Simplify right side
   91.89x = 8,983.31
5. Step 5: Solve for x
   x = 8,983.31/91.89
6. Step 6: Final answer
   x = 97.76