Finding the Fourth Proportional to 120,339.27, 166,062.56 and 72,581.67

Step by Step Solution

1. Step 1: Write the proportion equation
   120,339.27 : 166,062.56 = 72,581.67 : x
2. Step 2: Convert to fraction form
   120,339.27/166,062.56 = 72,581.67/x
3. Step 3: Cross multiply
   120,339.27x = 166,062.56 × 72,581.67
4. Step 4: Simplify right side
   120,339.27x = 12,053,097,566.37
5. Step 5: Solve for x
   x = 12,053,097,566.37/120,339.27
6. Step 6: Final answer
   x = 100,159.30