Finding the Fourth Proportional to 2,927.16, 4,389.06 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.16 : 4,389.06 = 978.30 : x
2. Step 2: Convert to fraction form
   2,927.16/4,389.06 = 978.30/x
3. Step 3: Cross multiply
   2,927.16x = 4,389.06 × 978.30
4. Step 4: Simplify right side
   2,927.16x = 4,293,817.40
5. Step 5: Solve for x
   x = 4,293,817.40/2,927.16
6. Step 6: Final answer
   x = 1,466.89