Finding the Fourth Proportional to 142,477.89, 196,619.67 and 78,819.99

Step by Step Solution

1. Step 1: Write the proportion equation
   142,477.89 : 196,619.67 = 78,819.99 : x
2. Step 2: Convert to fraction form
   142,477.89/196,619.67 = 78,819.99/x
3. Step 3: Cross multiply
   142,477.89x = 196,619.67 × 78,819.99
4. Step 4: Simplify right side
   142,477.89x = 15,497,560,423.20
5. Step 5: Solve for x
   x = 15,497,560,423.20/142,477.89
6. Step 6: Final answer
   x = 108,771.69