Finding the Fourth Proportional to 268,662.89, 402,979.76 and 81,659.81

Step by Step Solution

1. Step 1: Write the proportion equation
   268,662.89 : 402,979.76 = 81,659.81 : x
2. Step 2: Convert to fraction form
   268,662.89/402,979.76 = 81,659.81/x
3. Step 3: Cross multiply
   268,662.89x = 402,979.76 × 81,659.81
4. Step 4: Simplify right side
   268,662.89x = 32,907,250,635.45
5. Step 5: Solve for x
   x = 32,907,250,635.45/268,662.89
6. Step 6: Final answer
   x = 122,485.28