Finding the Fourth Proportional to 8,978.46, 13,439.96 and 5,851.74

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.46 : 13,439.96 = 5,851.74 : x
2. Step 2: Convert to fraction form
   8,978.46/13,439.96 = 5,851.74/x
3. Step 3: Cross multiply
   8,978.46x = 13,439.96 × 5,851.74
4. Step 4: Simplify right side
   8,978.46x = 78,647,122.27
5. Step 5: Solve for x
   x = 78,647,122.27/8,978.46
6. Step 6: Final answer
   x = 8,759.53