Finding the Fourth Proportional to 111,960.40, 154,519.48 and 64,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111,960.40 : 154,519.48 = 64,212.72 : x
2. Step 2: Convert to fraction form
   111,960.40/154,519.48 = 64,212.72/x
3. Step 3: Cross multiply
   111,960.40x = 154,519.48 × 64,212.72
4. Step 4: Simplify right side
   111,960.40x = 9,922,116,103.79
5. Step 5: Solve for x
   x = 9,922,116,103.79/111,960.40
6. Step 6: Final answer
   x = 88,621.66