Finding the Fourth Proportional to 2,927.97, 4,390.59 and 978.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.97 : 4,390.59 = 978.81 : x
2. Step 2: Convert to fraction form
   2,927.97/4,390.59 = 978.81/x
3. Step 3: Cross multiply
   2,927.97x = 4,390.59 × 978.81
4. Step 4: Simplify right side
   2,927.97x = 4,297,553.40
5. Step 5: Solve for x
   x = 4,297,553.40/2,927.97
6. Step 6: Final answer
   x = 1,467.76