Finding the Fourth Proportional to 3,384.09, 5,074.52 and 1,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,384.09 : 5,074.52 = 1,978.91 : x
2. Step 2: Convert to fraction form
   3,384.09/5,074.52 = 1,978.91/x
3. Step 3: Cross multiply
   3,384.09x = 5,074.52 × 1,978.91
4. Step 4: Simplify right side
   3,384.09x = 10,042,004.56
5. Step 5: Solve for x
   x = 10,042,004.56/3,384.09
6. Step 6: Final answer
   x = 2,967.42