Finding the Fourth Proportional to 2,622.66, 3,932.16 and 978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.66 : 3,932.16 = 978.76 : x
2. Step 2: Convert to fraction form
   2,622.66/3,932.16 = 978.76/x
3. Step 3: Cross multiply
   2,622.66x = 3,932.16 × 978.76
4. Step 4: Simplify right side
   2,622.66x = 3,848,640.92
5. Step 5: Solve for x
   x = 3,848,640.92/2,622.66
6. Step 6: Final answer
   x = 1,467.46