Finding the Fourth Proportional to 120,236.89, 165,980.06 and 71,855.89

Step by Step Solution

1. Step 1: Write the proportion equation
   120,236.89 : 165,980.06 = 71,855.89 : x
2. Step 2: Convert to fraction form
   120,236.89/165,980.06 = 71,855.89/x
3. Step 3: Cross multiply
   120,236.89x = 165,980.06 × 71,855.89
4. Step 4: Simplify right side
   120,236.89x = 11,926,644,933.55
5. Step 5: Solve for x
   x = 11,926,644,933.55/120,236.89
6. Step 6: Final answer
   x = 99,192.89