Finding the Fourth Proportional to 2,620.41, 3,932.13 and 978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.41 : 3,932.13 = 978.12 : x
2. Step 2: Convert to fraction form
   2,620.41/3,932.13 = 978.12/x
3. Step 3: Cross multiply
   2,620.41x = 3,932.13 × 978.12
4. Step 4: Simplify right side
   2,620.41x = 3,846,095.00
5. Step 5: Solve for x
   x = 3,846,095.00/2,620.41
6. Step 6: Final answer
   x = 1,467.75