Finding the Fourth Proportional to 2,942.79, 4,413.21 and 1,187.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,942.79 : 4,413.21 = 1,187.34 : x
2. Step 2: Convert to fraction form
   2,942.79/4,413.21 = 1,187.34/x
3. Step 3: Cross multiply
   2,942.79x = 4,413.21 × 1,187.34
4. Step 4: Simplify right side
   2,942.79x = 5,239,980.76
5. Step 5: Solve for x
   x = 5,239,980.76/2,942.79
6. Step 6: Final answer
   x = 1,780.62