Finding the Fourth Proportional to 419,086.20, 578,338.88 and 228,100.98

Step by Step Solution

1. Step 1: Write the proportion equation
   419,086.20 : 578,338.88 = 228,100.98 : x
2. Step 2: Convert to fraction form
   419,086.20/578,338.88 = 228,100.98/x
3. Step 3: Cross multiply
   419,086.20x = 578,338.88 × 228,100.98
4. Step 4: Simplify right side
   419,086.20x = 131,919,665,300.10
5. Step 5: Solve for x
   x = 131,919,665,300.10/419,086.20
6. Step 6: Final answer
   x = 314,779.31