Finding the Fourth Proportional to 2,709.45, 4,064.17 and 978.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.45 : 4,064.17 = 978.07 : x
2. Step 2: Convert to fraction form
   2,709.45/4,064.17 = 978.07/x
3. Step 3: Cross multiply
   2,709.45x = 4,064.17 × 978.07
4. Step 4: Simplify right side
   2,709.45x = 3,975,042.75
5. Step 5: Solve for x
   x = 3,975,042.75/2,709.45
6. Step 6: Final answer
   x = 1,467.10