Finding the Fourth Proportional to 2,074.18, 3,106.23 and 978.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.18 : 3,106.23 = 978.85 : x
2. Step 2: Convert to fraction form
   2,074.18/3,106.23 = 978.85/x
3. Step 3: Cross multiply
   2,074.18x = 3,106.23 × 978.85
4. Step 4: Simplify right side
   2,074.18x = 3,040,533.24
5. Step 5: Solve for x
   x = 3,040,533.24/2,074.18
6. Step 6: Final answer
   x = 1,465.90