Finding the Fourth Proportional to 120,615.62, 166,425.55 and 72,871.61

Step by Step Solution

1. Step 1: Write the proportion equation
   120,615.62 : 166,425.55 = 72,871.61 : x
2. Step 2: Convert to fraction form
   120,615.62/166,425.55 = 72,871.61/x
3. Step 3: Cross multiply
   120,615.62x = 166,425.55 × 72,871.61
4. Step 4: Simplify right side
   120,615.62x = 12,127,696,759.33
5. Step 5: Solve for x
   x = 12,127,696,759.33/120,615.62
6. Step 6: Final answer
   x = 100,548.31