Finding the Fourth Proportional to 109.89, 151.65 and 71.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109.89 : 151.65 = 71.10 : x
2. Step 2: Convert to fraction form
   109.89/151.65 = 71.10/x
3. Step 3: Cross multiply
   109.89x = 151.65 × 71.10
4. Step 4: Simplify right side
   109.89x = 10,782.32
5. Step 5: Solve for x
   x = 10,782.32/109.89
6. Step 6: Final answer
   x = 98.12