Finding the Fourth Proportional to 1,289,086.56, 1,932,965.64 and 578,505.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289,086.56 : 1,932,965.64 = 578,505.42 : x
2. Step 2: Convert to fraction form
   1,289,086.56/1,932,965.64 = 578,505.42/x
3. Step 3: Cross multiply
   1,289,086.56x = 1,932,965.64 × 578,505.42
4. Step 4: Simplify right side
   1,289,086.56x = 1,118,231,099,413.77
5. Step 5: Solve for x
   x = 1,118,231,099,413.77/1,289,086.56
6. Step 6: Final answer
   x = 867,460.06