Finding the Fourth Proportional to 3,575.72, 5,363.55 and 978.65

Step by Step Solution

1. Step 1: Write the proportion equation
   3,575.72 : 5,363.55 = 978.65 : x
2. Step 2: Convert to fraction form
   3,575.72/5,363.55 = 978.65/x
3. Step 3: Cross multiply
   3,575.72x = 5,363.55 × 978.65
4. Step 4: Simplify right side
   3,575.72x = 5,249,038.21
5. Step 5: Solve for x
   x = 5,249,038.21/3,575.72
6. Step 6: Final answer
   x = 1,467.97