Finding the Fourth Proportional to 142,575.72, 196,745.94 and 78,909.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,575.72 : 196,745.94 = 78,909.72 : x
2. Step 2: Convert to fraction form
   142,575.72/196,745.94 = 78,909.72/x
3. Step 3: Cross multiply
   142,575.72x = 196,745.94 × 78,909.72
4. Step 4: Simplify right side
   142,575.72x = 15,525,167,036.54
5. Step 5: Solve for x
   x = 15,525,167,036.54/142,575.72
6. Step 6: Final answer
   x = 108,890.68