Finding the Fourth Proportional to 120,598.20, 166,404.06 and 72,819.54

Step by Step Solution

1. Step 1: Write the proportion equation
   120,598.20 : 166,404.06 = 72,819.54 : x
2. Step 2: Convert to fraction form
   120,598.20/166,404.06 = 72,819.54/x
3. Step 3: Cross multiply
   120,598.20x = 166,404.06 × 72,819.54
4. Step 4: Simplify right side
   120,598.20x = 12,117,467,103.33
5. Step 5: Solve for x
   x = 12,117,467,103.33/120,598.20
6. Step 6: Final answer
   x = 100,478.01