Finding the Fourth Proportional to 120,486.42, 166,271.67 and 72,740.16

Step by Step Solution

1. Step 1: Write the proportion equation
   120,486.42 : 166,271.67 = 72,740.16 : x
2. Step 2: Convert to fraction form
   120,486.42/166,271.67 = 72,740.16/x
3. Step 3: Cross multiply
   120,486.42x = 166,271.67 × 72,740.16
4. Step 4: Simplify right side
   120,486.42x = 12,094,627,879.27
5. Step 5: Solve for x
   x = 12,094,627,879.27/120,486.42
6. Step 6: Final answer
   x = 100,381.67