Finding the Fourth Proportional to 12,816.89, 17,687.31 and 7,511.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.89 : 17,687.31 = 7,511.70 : x
2. Step 2: Convert to fraction form
   12,816.89/17,687.31 = 7,511.70/x
3. Step 3: Cross multiply
   12,816.89x = 17,687.31 × 7,511.70
4. Step 4: Simplify right side
   12,816.89x = 132,861,766.53
5. Step 5: Solve for x
   x = 132,861,766.53/12,816.89
6. Step 6: Final answer
   x = 10,366.15