Finding the Fourth Proportional to 12,927.20, 17,834.04 and 7,890.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,927.20 : 17,834.04 = 7,890.71 : x
2. Step 2: Convert to fraction form
   12,927.20/17,834.04 = 7,890.71/x
3. Step 3: Cross multiply
   12,927.20x = 17,834.04 × 7,890.71
4. Step 4: Simplify right side
   12,927.20x = 140,723,148.60
5. Step 5: Solve for x
   x = 140,723,148.60/12,927.20
6. Step 6: Final answer
   x = 10,885.82