Finding the Fourth Proportional to 142,118.69, 196,118.61 and 78,455.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,118.69 : 196,118.61 = 78,455.12 : x
2. Step 2: Convert to fraction form
   142,118.69/196,118.61 = 78,455.12/x
3. Step 3: Cross multiply
   142,118.69x = 196,118.61 × 78,455.12
4. Step 4: Simplify right side
   142,118.69x = 15,386,509,081.78
5. Step 5: Solve for x
   x = 15,386,509,081.78/142,118.69
6. Step 6: Final answer
   x = 108,265.20