Finding the Fourth Proportional to 2,622.34, 3,929.43 and 978.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.34 : 3,929.43 = 978.45 : x
2. Step 2: Convert to fraction form
   2,622.34/3,929.43 = 978.45/x
3. Step 3: Cross multiply
   2,622.34x = 3,929.43 × 978.45
4. Step 4: Simplify right side
   2,622.34x = 3,844,731.14
5. Step 5: Solve for x
   x = 3,844,731.14/2,622.34
6. Step 6: Final answer
   x = 1,466.15