Finding the Fourth Proportional to 2,927.82, 4,388.70 and 978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.82 : 4,388.70 = 978.60 : x
2. Step 2: Convert to fraction form
   2,927.82/4,388.70 = 978.60/x
3. Step 3: Cross multiply
   2,927.82x = 4,388.70 × 978.60
4. Step 4: Simplify right side
   2,927.82x = 4,294,781.82
5. Step 5: Solve for x
   x = 4,294,781.82/2,927.82
6. Step 6: Final answer
   x = 1,466.89