Finding the Fourth Proportional to 540,128, 745,367.82 and 298,420.76

Step by Step Solution

1. Step 1: Write the proportion equation
   540,128 : 745,367.82 = 298,420.76 : x
2. Step 2: Convert to fraction form
   540,128/745,367.82 = 298,420.76/x
3. Step 3: Cross multiply
   540,128x = 745,367.82 × 298,420.76
4. Step 4: Simplify right side
   540,128x = 222,433,231,323.94
5. Step 5: Solve for x
   x = 222,433,231,323.94/540,128
6. Step 6: Final answer
   x = 411,815.78