Finding the Fourth Proportional to 109.89, 151.71 and 71.13

Step by Step Solution

1. Step 1: Write the proportion equation
   109.89 : 151.71 = 71.13 : x
2. Step 2: Convert to fraction form
   109.89/151.71 = 71.13/x
3. Step 3: Cross multiply
   109.89x = 151.71 × 71.13
4. Step 4: Simplify right side
   109.89x = 10,791.13
5. Step 5: Solve for x
   x = 10,791.13/109.89
6. Step 6: Final answer
   x = 98.20