Finding the Fourth Proportional to 10,610.12, 15,903.18 and 5,405

Step by Step Solution

1. Step 1: Write the proportion equation
   10,610.12 : 15,903.18 = 5,405 : x
2. Step 2: Convert to fraction form
   10,610.12/15,903.18 = 5,405/x
3. Step 3: Cross multiply
   10,610.12x = 15,903.18 × 5,405
4. Step 4: Simplify right side
   10,610.12x = 85,956,687.90
5. Step 5: Solve for x
   x = 85,956,687.90/10,610.12
6. Step 6: Final answer
   x = 8,101.39