Finding the Fourth Proportional to 12,910.42, 17,812.14 and 7,872.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.42 : 17,812.14 = 7,872.83 : x
2. Step 2: Convert to fraction form
   12,910.42/17,812.14 = 7,872.83/x
3. Step 3: Cross multiply
   12,910.42x = 17,812.14 × 7,872.83
4. Step 4: Simplify right side
   12,910.42x = 140,231,898.37
5. Step 5: Solve for x
   x = 140,231,898.37/12,910.42
6. Step 6: Final answer
   x = 10,861.92