Finding the Fourth Proportional to 2,927.88, 4,388.76 and 978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.88 : 4,388.76 = 978.48 : x
2. Step 2: Convert to fraction form
   2,927.88/4,388.76 = 978.48/x
3. Step 3: Cross multiply
   2,927.88x = 4,388.76 × 978.48
4. Step 4: Simplify right side
   2,927.88x = 4,294,313.88
5. Step 5: Solve for x
   x = 4,294,313.88/2,927.88
6. Step 6: Final answer
   x = 1,466.70