Finding the Fourth Proportional to 10,947.56, 16,421.54 and 3,156.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,947.56 : 16,421.54 = 3,156.57 : x
2. Step 2: Convert to fraction form
   10,947.56/16,421.54 = 3,156.57/x
3. Step 3: Cross multiply
   10,947.56x = 16,421.54 × 3,156.57
4. Step 4: Simplify right side
   10,947.56x = 51,835,724.73
5. Step 5: Solve for x
   x = 51,835,724.73/10,947.56
6. Step 6: Final answer
   x = 4,734.91