Finding the Fourth Proportional to 10,947.12, 15,101.40 and 7,171.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,947.12 : 15,101.40 = 7,171.44 : x
2. Step 2: Convert to fraction form
   10,947.12/15,101.40 = 7,171.44/x
3. Step 3: Cross multiply
   10,947.12x = 15,101.40 × 7,171.44
4. Step 4: Simplify right side
   10,947.12x = 108,298,784.02
5. Step 5: Solve for x
   x = 108,298,784.02/10,947.12
6. Step 6: Final answer
   x = 9,892.90