Finding the Fourth Proportional to 2,378.79, 3,282.85 and 1,316.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,378.79 : 3,282.85 = 1,316.55 : x
2. Step 2: Convert to fraction form
   2,378.79/3,282.85 = 1,316.55/x
3. Step 3: Cross multiply
   2,378.79x = 3,282.85 × 1,316.55
4. Step 4: Simplify right side
   2,378.79x = 4,322,042.72
5. Step 5: Solve for x
   x = 4,322,042.72/2,378.79
6. Step 6: Final answer
   x = 1,816.91