Finding the Fourth Proportional to 3,981.78, 5,973.62 and 1,208.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,981.78 : 5,973.62 = 1,208.61 : x
2. Step 2: Convert to fraction form
   3,981.78/5,973.62 = 1,208.61/x
3. Step 3: Cross multiply
   3,981.78x = 5,973.62 × 1,208.61
4. Step 4: Simplify right side
   3,981.78x = 7,219,770.83
5. Step 5: Solve for x
   x = 7,219,770.83/3,981.78
6. Step 6: Final answer
   x = 1,813.20