Finding the Fourth Proportional to 268,659.39, 402,974.50 and 81,656.31

Step by Step Solution

1. Step 1: Write the proportion equation
   268,659.39 : 402,974.50 = 81,656.31 : x
2. Step 2: Convert to fraction form
   268,659.39/402,974.50 = 81,656.31/x
3. Step 3: Cross multiply
   268,659.39x = 402,974.50 × 81,656.31
4. Step 4: Simplify right side
   268,659.39x = 32,905,410,694.10
5. Step 5: Solve for x
   x = 32,905,410,694.10/268,659.39
6. Step 6: Final answer
   x = 122,480.03