Finding the Fourth Proportional to 142,288.10, 213,432.15 and 133,072.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,288.10 : 213,432.15 = 133,072.10 : x
2. Step 2: Convert to fraction form
   142,288.10/213,432.15 = 133,072.10/x
3. Step 3: Cross multiply
   142,288.10x = 213,432.15 × 133,072.10
4. Step 4: Simplify right side
   142,288.10x = 28,401,864,408.02
5. Step 5: Solve for x
   x = 28,401,864,408.02/142,288.10
6. Step 6: Final answer
   x = 199,608.15