Finding the Fourth Proportional to 3,751.90, 5,627.36 and 978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,751.90 : 5,627.36 = 978.78 : x
2. Step 2: Convert to fraction form
   3,751.90/5,627.36 = 978.78/x
3. Step 3: Cross multiply
   3,751.90x = 5,627.36 × 978.78
4. Step 4: Simplify right side
   3,751.90x = 5,507,947.42
5. Step 5: Solve for x
   x = 5,507,947.42/3,751.90
6. Step 6: Final answer
   x = 1,468.04