Finding the Fourth Proportional to 8,410.83, 12,660.11 and 7,142.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,410.83 : 12,660.11 = 7,142.37 : x
2. Step 2: Convert to fraction form
   8,410.83/12,660.11 = 7,142.37/x
3. Step 3: Cross multiply
   8,410.83x = 12,660.11 × 7,142.37
4. Step 4: Simplify right side
   8,410.83x = 90,423,154.15
5. Step 5: Solve for x
   x = 90,423,154.15/8,410.83
6. Step 6: Final answer
   x = 10,750.80