Finding the Fourth Proportional to 142,133.61, 196,143.83 and 78,470.94

Step by Step Solution

1. Step 1: Write the proportion equation
   142,133.61 : 196,143.83 = 78,470.94 : x
2. Step 2: Convert to fraction form
   142,133.61/196,143.83 = 78,470.94/x
3. Step 3: Cross multiply
   142,133.61x = 196,143.83 × 78,470.94
4. Step 4: Simplify right side
   142,133.61x = 15,391,590,715.30
5. Step 5: Solve for x
   x = 15,391,590,715.30/142,133.61
6. Step 6: Final answer
   x = 108,289.59