Finding the Fourth Proportional to 120,820.86, 166,728.15 and 67,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   120,820.86 : 166,728.15 = 67,109.31 : x
2. Step 2: Convert to fraction form
   120,820.86/166,728.15 = 67,109.31/x
3. Step 3: Cross multiply
   120,820.86x = 166,728.15 × 67,109.31
4. Step 4: Simplify right side
   120,820.86x = 11,189,011,104.08
5. Step 5: Solve for x
   x = 11,189,011,104.08/120,820.86
6. Step 6: Final answer
   x = 92,608.27