Finding the Fourth Proportional to 142,780, 197,040.72 and 79,111.84

Step by Step Solution

1. Step 1: Write the proportion equation
   142,780 : 197,040.72 = 79,111.84 : x
2. Step 2: Convert to fraction form
   142,780/197,040.72 = 79,111.84/x
3. Step 3: Cross multiply
   142,780x = 197,040.72 × 79,111.84
4. Step 4: Simplify right side
   142,780x = 15,588,253,914.12
5. Step 5: Solve for x
   x = 15,588,253,914.12/142,780
6. Step 6: Final answer
   x = 109,176.73