Finding the Fourth Proportional to 287,716, 397,086.56 and 165,256.56

Step by Step Solution

1. Step 1: Write the proportion equation
   287,716 : 397,086.56 = 165,256.56 : x
2. Step 2: Convert to fraction form
   287,716/397,086.56 = 165,256.56/x
3. Step 3: Cross multiply
   287,716x = 397,086.56 × 165,256.56
4. Step 4: Simplify right side
   287,716x = 65,621,158,927.83
5. Step 5: Solve for x
   x = 65,621,158,927.83/287,716
6. Step 6: Final answer
   x = 228,076.15