Finding the Fourth Proportional to 5,815.41, 8,019.16 and 4,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,815.41 : 8,019.16 = 4,978.88 : x
2. Step 2: Convert to fraction form
   5,815.41/8,019.16 = 4,978.88/x
3. Step 3: Cross multiply
   5,815.41x = 8,019.16 × 4,978.88
4. Step 4: Simplify right side
   5,815.41x = 39,926,435.34
5. Step 5: Solve for x
   x = 39,926,435.34/5,815.41
6. Step 6: Final answer
   x = 6,865.63