Finding the Fourth Proportional to 142,126.56, 196,134.60 and 78,468.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,126.56 : 196,134.60 = 78,468.72 : x
2. Step 2: Convert to fraction form
   142,126.56/196,134.60 = 78,468.72/x
3. Step 3: Cross multiply
   142,126.56x = 196,134.60 × 78,468.72
4. Step 4: Simplify right side
   142,126.56x = 15,390,431,009.71
5. Step 5: Solve for x
   x = 15,390,431,009.71/142,126.56
6. Step 6: Final answer
   x = 108,286.80