Finding the Fourth Proportional to 419,719.59, 579,196.17 and 228,728.88

Step by Step Solution

1. Step 1: Write the proportion equation
   419,719.59 : 579,196.17 = 228,728.88 : x
2. Step 2: Convert to fraction form
   419,719.59/579,196.17 = 228,728.88/x
3. Step 3: Cross multiply
   419,719.59x = 579,196.17 × 228,728.88
4. Step 4: Simplify right side
   419,719.59x = 132,478,891,264.39
5. Step 5: Solve for x
   x = 132,478,891,264.39/419,719.59
6. Step 6: Final answer
   x = 315,636.66