Finding the Fourth Proportional to 2,927.01, 4,389.60 and 978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.01 : 4,389.60 = 978.76 : x
2. Step 2: Convert to fraction form
   2,927.01/4,389.60 = 978.76/x
3. Step 3: Cross multiply
   2,927.01x = 4,389.60 × 978.76
4. Step 4: Simplify right side
   2,927.01x = 4,296,338.05
5. Step 5: Solve for x
   x = 4,296,338.05/2,927.01
6. Step 6: Final answer
   x = 1,467.82