Finding the Fourth Proportional to 142,631.98, 196,845.34 and 78,969.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,631.98 : 196,845.34 = 78,969.78 : x
2. Step 2: Convert to fraction form
   142,631.98/196,845.34 = 78,969.78/x
3. Step 3: Cross multiply
   142,631.98x = 196,845.34 × 78,969.78
4. Step 4: Simplify right side
   142,631.98x = 15,544,833,193.83
5. Step 5: Solve for x
   x = 15,544,833,193.83/142,631.98
6. Step 6: Final answer
   x = 108,985.61