Finding the Fourth Proportional to 2,149.56, 3,223.72 and 978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.56 : 3,223.72 = 978.91 : x
2. Step 2: Convert to fraction form
   2,149.56/3,223.72 = 978.91/x
3. Step 3: Cross multiply
   2,149.56x = 3,223.72 × 978.91
4. Step 4: Simplify right side
   2,149.56x = 3,155,731.75
5. Step 5: Solve for x
   x = 3,155,731.75/2,149.56
6. Step 6: Final answer
   x = 1,468.08