Finding the Fourth Proportional to 10,947.24, 16,421.64 and 3,156.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,947.24 : 16,421.64 = 3,156.72 : x
2. Step 2: Convert to fraction form
   10,947.24/16,421.64 = 3,156.72/x
3. Step 3: Cross multiply
   10,947.24x = 16,421.64 × 3,156.72
4. Step 4: Simplify right side
   10,947.24x = 51,838,519.42
5. Step 5: Solve for x
   x = 51,838,519.42/10,947.24
6. Step 6: Final answer
   x = 4,735.30