Finding the Fourth Proportional to 10,665.96, 16,006.80 and 8,610.54

Step by Step Solution

1. Step 1: Write the proportion equation
   10,665.96 : 16,006.80 = 8,610.54 : x
2. Step 2: Convert to fraction form
   10,665.96/16,006.80 = 8,610.54/x
3. Step 3: Cross multiply
   10,665.96x = 16,006.80 × 8,610.54
4. Step 4: Simplify right side
   10,665.96x = 137,827,191.67
5. Step 5: Solve for x
   x = 137,827,191.67/10,665.96
6. Step 6: Final answer
   x = 12,922.16