Finding the Fourth Proportional to 142,756.40, 197,007.72 and 79,101.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,756.40 : 197,007.72 = 79,101.20 : x
2. Step 2: Convert to fraction form
   142,756.40/197,007.72 = 79,101.20/x
3. Step 3: Cross multiply
   142,756.40x = 197,007.72 × 79,101.20
4. Step 4: Simplify right side
   142,756.40x = 15,583,547,061.26
5. Step 5: Solve for x
   x = 15,583,547,061.26/142,756.40
6. Step 6: Final answer
   x = 109,161.81