Finding the Fourth Proportional to 120,623.72, 166,456.76 and 72,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   120,623.72 : 166,456.76 = 72,868.72 : x
2. Step 2: Convert to fraction form
   120,623.72/166,456.76 = 72,868.72/x
3. Step 3: Cross multiply
   120,623.72x = 166,456.76 × 72,868.72
4. Step 4: Simplify right side
   120,623.72x = 12,129,491,036.55
5. Step 5: Solve for x
   x = 12,129,491,036.55/120,623.72
6. Step 6: Final answer
   x = 100,556.43