Finding the Fourth Proportional to 142,493.69, 196,630.45 and 78,830.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,493.69 : 196,630.45 = 78,830.12 : x
2. Step 2: Convert to fraction form
   142,493.69/196,630.45 = 78,830.12/x
3. Step 3: Cross multiply
   142,493.69x = 196,630.45 × 78,830.12
4. Step 4: Simplify right side
   142,493.69x = 15,500,401,969.15
5. Step 5: Solve for x
   x = 15,500,401,969.15/142,493.69
6. Step 6: Final answer
   x = 108,779.57