Finding the Fourth Proportional to 120,405.76, 166,158.12 and 65,957.50

Step by Step Solution

1. Step 1: Write the proportion equation
   120,405.76 : 166,158.12 = 65,957.50 : x
2. Step 2: Convert to fraction form
   120,405.76/166,158.12 = 65,957.50/x
3. Step 3: Cross multiply
   120,405.76x = 166,158.12 × 65,957.50
4. Step 4: Simplify right side
   120,405.76x = 10,959,374,199.90
5. Step 5: Solve for x
   x = 10,959,374,199.90/120,405.76
6. Step 6: Final answer
   x = 91,020.35