Finding the Fourth Proportional to 678,226, 935,995.62 and 376,420

Step by Step Solution

1. Step 1: Write the proportion equation
   678,226 : 935,995.62 = 376,420 : x
2. Step 2: Convert to fraction form
   678,226/935,995.62 = 376,420/x
3. Step 3: Cross multiply
   678,226x = 935,995.62 × 376,420
4. Step 4: Simplify right side
   678,226x = 352,327,471,280.40
5. Step 5: Solve for x
   x = 352,327,471,280.40/678,226
6. Step 6: Final answer
   x = 519,483.88