Finding the Fourth Proportional to 109.86, 151.47 and 89.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109.86 : 151.47 = 89.10 : x
2. Step 2: Convert to fraction form
   109.86/151.47 = 89.10/x
3. Step 3: Cross multiply
   109.86x = 151.47 × 89.10
4. Step 4: Simplify right side
   109.86x = 13,495.98
5. Step 5: Solve for x
   x = 13,495.98/109.86
6. Step 6: Final answer
   x = 122.85