Finding the Fourth Proportional to 142,928.70, 197,253.72 and 79,287

Step by Step Solution

1. Step 1: Write the proportion equation
   142,928.70 : 197,253.72 = 79,287 : x
2. Step 2: Convert to fraction form
   142,928.70/197,253.72 = 79,287/x
3. Step 3: Cross multiply
   142,928.70x = 197,253.72 × 79,287
4. Step 4: Simplify right side
   142,928.70x = 15,639,655,697.64
5. Step 5: Solve for x
   x = 15,639,655,697.64/142,928.70
6. Step 6: Final answer
   x = 109,422.78