Finding the Fourth Proportional to 419,276.72, 578,612.28 and 228,300.59

Step by Step Solution

1. Step 1: Write the proportion equation
   419,276.72 : 578,612.28 = 228,300.59 : x
2. Step 2: Convert to fraction form
   419,276.72/578,612.28 = 228,300.59/x
3. Step 3: Cross multiply
   419,276.72x = 578,612.28 × 228,300.59
4. Step 4: Simplify right side
   419,276.72x = 132,097,524,905.25
5. Step 5: Solve for x
   x = 132,097,524,905.25/419,276.72
6. Step 6: Final answer
   x = 315,060.48