Finding the Fourth Proportional to 678,081.78, 935,520.57 and 387,484.56

Step by Step Solution

1. Step 1: Write the proportion equation
   678,081.78 : 935,520.57 = 387,484.56 : x
2. Step 2: Convert to fraction form
   678,081.78/935,520.57 = 387,484.56/x
3. Step 3: Cross multiply
   678,081.78x = 935,520.57 × 387,484.56
4. Step 4: Simplify right side
   678,081.78x = 362,499,776,437.40
5. Step 5: Solve for x
   x = 362,499,776,437.40/678,081.78
6. Step 6: Final answer
   x = 534,595.95