Finding the Fourth Proportional to 12,810.70, 17,680.52 and 7,507.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.70 : 17,680.52 = 7,507.63 : x
2. Step 2: Convert to fraction form
   12,810.70/17,680.52 = 7,507.63/x
3. Step 3: Cross multiply
   12,810.70x = 17,680.52 × 7,507.63
4. Step 4: Simplify right side
   12,810.70x = 132,738,676.43
5. Step 5: Solve for x
   x = 132,738,676.43/12,810.70
6. Step 6: Final answer
   x = 10,361.55