Finding the Fourth Proportional to 111,438.72, 167,227.20 and 99,964.80

Step by Step Solution

1. Step 1: Write the proportion equation
   111,438.72 : 167,227.20 = 99,964.80 : x
2. Step 2: Convert to fraction form
   111,438.72/167,227.20 = 99,964.80/x
3. Step 3: Cross multiply
   111,438.72x = 167,227.20 × 99,964.80
4. Step 4: Simplify right side
   111,438.72x = 16,716,833,602.56
5. Step 5: Solve for x
   x = 16,716,833,602.56/111,438.72
6. Step 6: Final answer
   x = 150,009.20