Finding the Fourth Proportional to 10,947.12, 16,422 and 3,156

Step by Step Solution

1. Step 1: Write the proportion equation
   10,947.12 : 16,422 = 3,156 : x
2. Step 2: Convert to fraction form
   10,947.12/16,422 = 3,156/x
3. Step 3: Cross multiply
   10,947.12x = 16,422 × 3,156
4. Step 4: Simplify right side
   10,947.12x = 51,827,832
5. Step 5: Solve for x
   x = 51,827,832/10,947.12
6. Step 6: Final answer
   x = 4,734.38