Finding the Fourth Proportional to 6,978.72, 10,472.16 and 2,599.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.72 : 10,472.16 = 2,599.28 : x
2. Step 2: Convert to fraction form
   6,978.72/10,472.16 = 2,599.28/x
3. Step 3: Cross multiply
   6,978.72x = 10,472.16 × 2,599.28
4. Step 4: Simplify right side
   6,978.72x = 27,220,076.04
5. Step 5: Solve for x
   x = 27,220,076.04/6,978.72
6. Step 6: Final answer
   x = 3,900.44