Finding the Fourth Proportional to 2,210.92, 3,315.33 and 978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.92 : 3,315.33 = 978.67 : x
2. Step 2: Convert to fraction form
   2,210.92/3,315.33 = 978.67/x
3. Step 3: Cross multiply
   2,210.92x = 3,315.33 × 978.67
4. Step 4: Simplify right side
   2,210.92x = 3,244,614.01
5. Step 5: Solve for x
   x = 3,244,614.01/2,210.92
6. Step 6: Final answer
   x = 1,467.54