Finding the Fourth Proportional to 8,340.31, 11,493.73 and 5,978.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,340.31 : 11,493.73 = 5,978.35 : x
2. Step 2: Convert to fraction form
   8,340.31/11,493.73 = 5,978.35/x
3. Step 3: Cross multiply
   8,340.31x = 11,493.73 × 5,978.35
4. Step 4: Simplify right side
   8,340.31x = 68,713,562.59
5. Step 5: Solve for x
   x = 68,713,562.59/8,340.31
6. Step 6: Final answer
   x = 8,238.73