Finding the Fourth Proportional to 142,294.10, 213,441.15 and 133,078.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,294.10 : 213,441.15 = 133,078.10 : x
2. Step 2: Convert to fraction form
   142,294.10/213,441.15 = 133,078.10/x
3. Step 3: Cross multiply
   142,294.10x = 213,441.15 × 133,078.10
4. Step 4: Simplify right side
   142,294.10x = 28,404,342,703.82
5. Step 5: Solve for x
   x = 28,404,342,703.82/142,294.10
6. Step 6: Final answer
   x = 199,617.15