Finding the Fourth Proportional to 121,012.06, 166,993.72 and 65,819.96

Step by Step Solution

1. Step 1: Write the proportion equation
   121,012.06 : 166,993.72 = 65,819.96 : x
2. Step 2: Convert to fraction form
   121,012.06/166,993.72 = 65,819.96/x
3. Step 3: Cross multiply
   121,012.06x = 166,993.72 × 65,819.96
4. Step 4: Simplify right side
   121,012.06x = 10,991,520,906.94
5. Step 5: Solve for x
   x = 10,991,520,906.94/121,012.06
6. Step 6: Final answer
   x = 90,829.96