Finding the Fourth Proportional to 12,915.28, 17,820.18 and 7,610.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.28 : 17,820.18 = 7,610.59 : x
2. Step 2: Convert to fraction form
   12,915.28/17,820.18 = 7,610.59/x
3. Step 3: Cross multiply
   12,915.28x = 17,820.18 × 7,610.59
4. Step 4: Simplify right side
   12,915.28x = 135,622,083.71
5. Step 5: Solve for x
   x = 135,622,083.71/12,915.28
6. Step 6: Final answer
   x = 10,500.90