Finding the Fourth Proportional to 111,072.50, 153,120.61 and 79,186.04

Step by Step Solution

1. Step 1: Write the proportion equation
   111,072.50 : 153,120.61 = 79,186.04 : x
2. Step 2: Convert to fraction form
   111,072.50/153,120.61 = 79,186.04/x
3. Step 3: Cross multiply
   111,072.50x = 153,120.61 × 79,186.04
4. Step 4: Simplify right side
   111,072.50x = 12,125,014,655.87
5. Step 5: Solve for x
   x = 12,125,014,655.87/111,072.50
6. Step 6: Final answer
   x = 109,163.07