Finding the Fourth Proportional to 111.86, 154.35 and 65.22

Step by Step Solution

1. Step 1: Write the proportion equation
   111.86 : 154.35 = 65.22 : x
2. Step 2: Convert to fraction form
   111.86/154.35 = 65.22/x
3. Step 3: Cross multiply
   111.86x = 154.35 × 65.22
4. Step 4: Simplify right side
   111.86x = 10,066.71
5. Step 5: Solve for x
   x = 10,066.71/111.86
6. Step 6: Final answer
   x = 89.99