Finding the Fourth Proportional to 12,815.63, 17,685.59 and 7,510.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.63 : 17,685.59 = 7,510.45 : x
2. Step 2: Convert to fraction form
   12,815.63/17,685.59 = 7,510.45/x
3. Step 3: Cross multiply
   12,815.63x = 17,685.59 × 7,510.45
4. Step 4: Simplify right side
   12,815.63x = 132,826,739.42
5. Step 5: Solve for x
   x = 132,826,739.42/12,815.63
6. Step 6: Final answer
   x = 10,364.43