Finding the Fourth Proportional to 8,608.58, 12,892.37 and 5,978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,608.58 : 12,892.37 = 5,978.71 : x
2. Step 2: Convert to fraction form
   8,608.58/12,892.37 = 5,978.71/x
3. Step 3: Cross multiply
   8,608.58x = 12,892.37 × 5,978.71
4. Step 4: Simplify right side
   8,608.58x = 77,079,727.66
5. Step 5: Solve for x
   x = 77,079,727.66/8,608.58
6. Step 6: Final answer
   x = 8,953.83