Finding the Fourth Proportional to 2,622.70, 3,932.43 and 978.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.70 : 3,932.43 = 978.40 : x
2. Step 2: Convert to fraction form
   2,622.70/3,932.43 = 978.40/x
3. Step 3: Cross multiply
   2,622.70x = 3,932.43 × 978.40
4. Step 4: Simplify right side
   2,622.70x = 3,847,489.51
5. Step 5: Solve for x
   x = 3,847,489.51/2,622.70
6. Step 6: Final answer
   x = 1,467.00