Finding the Fourth Proportional to 11,978.31, 16,529.34 and 6,942.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.31 : 16,529.34 = 6,942.15 : x
2. Step 2: Convert to fraction form
   11,978.31/16,529.34 = 6,942.15/x
3. Step 3: Cross multiply
   11,978.31x = 16,529.34 × 6,942.15
4. Step 4: Simplify right side
   11,978.31x = 114,749,157.68
5. Step 5: Solve for x
   x = 114,749,157.68/11,978.31
6. Step 6: Final answer
   x = 9,579.75