Finding the Fourth Proportional to 2,074.35, 3,111.48 and 978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.35 : 3,111.48 = 978.12 : x
2. Step 2: Convert to fraction form
   2,074.35/3,111.48 = 978.12/x
3. Step 3: Cross multiply
   2,074.35x = 3,111.48 × 978.12
4. Step 4: Simplify right side
   2,074.35x = 3,043,400.82
5. Step 5: Solve for x
   x = 3,043,400.82/2,074.35
6. Step 6: Final answer
   x = 1,467.16