Finding the Fourth Proportional to 142,131.60, 196,137.72 and 78,464.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142,131.60 : 196,137.72 = 78,464.88 : x
2. Step 2: Convert to fraction form
   142,131.60/196,137.72 = 78,464.88/x
3. Step 3: Cross multiply
   142,131.60x = 196,137.72 × 78,464.88
4. Step 4: Simplify right side
   142,131.60x = 15,389,922,663.27
5. Step 5: Solve for x
   x = 15,389,922,663.27/142,131.60
6. Step 6: Final answer
   x = 108,279.39