Finding the Fourth Proportional to 142,231.56, 196,279.92 and 78,567.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,231.56 : 196,279.92 = 78,567.72 : x
2. Step 2: Convert to fraction form
   142,231.56/196,279.92 = 78,567.72/x
3. Step 3: Cross multiply
   142,231.56x = 196,279.92 × 78,567.72
4. Step 4: Simplify right side
   142,231.56x = 15,421,265,796.18
5. Step 5: Solve for x
   x = 15,421,265,796.18/142,231.56
6. Step 6: Final answer
   x = 108,423.66