Finding the Fourth Proportional to 120,354.55, 166,091.78 and 65,908.98

Step by Step Solution

1. Step 1: Write the proportion equation
   120,354.55 : 166,091.78 = 65,908.98 : x
2. Step 2: Convert to fraction form
   120,354.55/166,091.78 = 65,908.98/x
3. Step 3: Cross multiply
   120,354.55x = 166,091.78 × 65,908.98
4. Step 4: Simplify right side
   120,354.55x = 10,946,939,806.18
5. Step 5: Solve for x
   x = 10,946,939,806.18/120,354.55
6. Step 6: Final answer
   x = 90,955.76