Finding the Fourth Proportional to 2,623.56, 3,934.14 and 978.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.56 : 3,934.14 = 978.90 : x
2. Step 2: Convert to fraction form
   2,623.56/3,934.14 = 978.90/x
3. Step 3: Cross multiply
   2,623.56x = 3,934.14 × 978.90
4. Step 4: Simplify right side
   2,623.56x = 3,851,129.65
5. Step 5: Solve for x
   x = 3,851,129.65/2,623.56
6. Step 6: Final answer
   x = 1,467.90