Finding the Fourth Proportional to 5,612.88, 8,419.41 and 3,978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,612.88 : 8,419.41 = 3,978.30 : x
2. Step 2: Convert to fraction form
   5,612.88/8,419.41 = 3,978.30/x
3. Step 3: Cross multiply
   5,612.88x = 8,419.41 × 3,978.30
4. Step 4: Simplify right side
   5,612.88x = 33,494,938.80
5. Step 5: Solve for x
   x = 33,494,938.80/5,612.88
6. Step 6: Final answer
   x = 5,967.51