Finding the Fourth Proportional to 3,751.71, 5,627.63 and 978.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,751.71 : 5,627.63 = 978.21 : x
2. Step 2: Convert to fraction form
   3,751.71/5,627.63 = 978.21/x
3. Step 3: Cross multiply
   3,751.71x = 5,627.63 × 978.21
4. Step 4: Simplify right side
   3,751.71x = 5,505,003.94
5. Step 5: Solve for x
   x = 5,505,003.94/3,751.71
6. Step 6: Final answer
   x = 1,467.33